Find the Inverse fifth root of 8-x+3

$\sqrt[5]{8 - x} + 3$

Step 1

Interchange the variables.

$x = \sqrt[5]{8 - y} + 3$

Step 2

Solve for $y$ .

Rewrite the equation as $\sqrt[5]{8 - y} + 3 = x$ .

$\sqrt[5]{8 - y} + 3 = x$

Subtract $3$ from both sides of the equation.

$\sqrt[5]{8 - y} = x - 3$

To remove the radical on the left side of the equation, raise both sides of the equation to the power of $5$ .

${\sqrt[5]{8 - y}}^{5} = {(x - 3)}^{5}$

Simplify each side of the equation.

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[5]{8 - y}$ as ${(8 - y)}^{\frac{1}{5}}$ .

${({(8 - y)}^{\frac{1}{5}})}^{5} = {(x - 3)}^{5}$

Simplify the left side.

Simplify ${({(8 - y)}^{\frac{1}{5}})}^{5}$ .

Multiply the exponents in ${({(8 - y)}^{\frac{1}{5}})}^{5}$ .

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

${(8 - y)}^{\frac{1}{5} \cdot 5} = {(x - 3)}^{5}$

Cancel the common factor of $5$ .

Cancel the common factor.

${(8 - y)}^{\frac{1}{5} \cdot 5} = {(x - 3)}^{5}$

Rewrite the expression.

${(8 - y)}^{1} = {(x - 3)}^{5}$

Simplify.

$8 - y = {(x - 3)}^{5}$

Simplify the right side.

Simplify ${(x - 3)}^{5}$ .

Use the Binomial Theorem.

$8 - y = x^{5} + 5 x^{4} \cdot - 3 + 10 x^{3} {(- 3)}^{2} + 10 x^{2} {(- 3)}^{3} + 5 x {(- 3)}^{4} + {(- 3)}^{5}$

Simplify each term.

Multiply $- 3$ by $5$ .

$8 - y = x^{5} - 15 x^{4} + 10 x^{3} {(- 3)}^{2} + 10 x^{2} {(- 3)}^{3} + 5 x {(- 3)}^{4} + {(- 3)}^{5}$

Raise $- 3$ to the power of $2$ .

$8 - y = x^{5} - 15 x^{4} + 10 x^{3} \cdot 9 + 10 x^{2} {(- 3)}^{3} + 5 x {(- 3)}^{4} + {(- 3)}^{5}$

Multiply $9$ by $10$ .

$8 - y = x^{5} - 15 x^{4} + 90 x^{3} + 10 x^{2} {(- 3)}^{3} + 5 x {(- 3)}^{4} + {(- 3)}^{5}$

Raise $- 3$ to the power of $3$ .

$8 - y = x^{5} - 15 x^{4} + 90 x^{3} + 10 x^{2} \cdot - 27 + 5 x {(- 3)}^{4} + {(- 3)}^{5}$

Multiply $- 27$ by $10$ .

$8 - y = x^{5} - 15 x^{4} + 90 x^{3} - 270 x^{2} + 5 x {(- 3)}^{4} + {(- 3)}^{5}$

Raise $- 3$ to the power of $4$ .

$8 - y = x^{5} - 15 x^{4} + 90 x^{3} - 270 x^{2} + 5 x \cdot 81 + {(- 3)}^{5}$

Multiply $81$ by $5$ .

$8 - y = x^{5} - 15 x^{4} + 90 x^{3} - 270 x^{2} + 405 x + {(- 3)}^{5}$

Raise $- 3$ to the power of $5$ .

$8 - y = x^{5} - 15 x^{4} + 90 x^{3} - 270 x^{2} + 405 x - 243$

Solve for $y$ .

Move all terms not containing $y$ to the right side of the equation.

Subtract $8$ from both sides of the equation.

$- y = x^{5} - 15 x^{4} + 90 x^{3} - 270 x^{2} + 405 x - 243 - 8$

Subtract $8$ from $- 243$ .

$- y = x^{5} - 15 x^{4} + 90 x^{3} - 270 x^{2} + 405 x - 251$

Divide each term in $- y = x^{5} - 15 x^{4} + 90 x^{3} - 270 x^{2} + 405 x - 251$ by $- 1$ and simplify.

Divide each term in $- y = x^{5} - 15 x^{4} + 90 x^{3} - 270 x^{2} + 405 x - 251$ by $- 1$ .

$\frac{- y}{- 1} = \frac{x^{5}}{- 1} + \frac{- 15 x^{4}}{- 1} + \frac{90 x^{3}}{- 1} + \frac{- 270 x^{2}}{- 1} + \frac{405 x}{- 1} + \frac{- 251}{- 1}$

Simplify the left side.

Dividing two negative values results in a positive value.

$\frac{y}{1} = \frac{x^{5}}{- 1} + \frac{- 15 x^{4}}{- 1} + \frac{90 x^{3}}{- 1} + \frac{- 270 x^{2}}{- 1} + \frac{405 x}{- 1} + \frac{- 251}{- 1}$

Divide $y$ by $1$ .

$y = \frac{x^{5}}{- 1} + \frac{- 15 x^{4}}{- 1} + \frac{90 x^{3}}{- 1} + \frac{- 270 x^{2}}{- 1} + \frac{405 x}{- 1} + \frac{- 251}{- 1}$

Simplify the right side.

Simplify each term.

Move the negative one from the denominator of $\frac{x^{5}}{- 1}$ .

$y = - 1 \cdot x^{5} + \frac{- 15 x^{4}}{- 1} + \frac{90 x^{3}}{- 1} + \frac{- 270 x^{2}}{- 1} + \frac{405 x}{- 1} + \frac{- 251}{- 1}$

Rewrite $- 1 \cdot x^{5}$ as $- x^{5}$ .

$y = - x^{5} + \frac{- 15 x^{4}}{- 1} + \frac{90 x^{3}}{- 1} + \frac{- 270 x^{2}}{- 1} + \frac{405 x}{- 1} + \frac{- 251}{- 1}$

Move the negative one from the denominator of $\frac{- 15 x^{4}}{- 1}$ .

$y = - x^{5} - 1 \cdot (- 15 x^{4}) + \frac{90 x^{3}}{- 1} + \frac{- 270 x^{2}}{- 1} + \frac{405 x}{- 1} + \frac{- 251}{- 1}$

Rewrite $- 1 \cdot (- 15 x^{4})$ as $- (- 15 x^{4})$ .

$y = - x^{5} - (- 15 x^{4}) + \frac{90 x^{3}}{- 1} + \frac{- 270 x^{2}}{- 1} + \frac{405 x}{- 1} + \frac{- 251}{- 1}$

Multiply $- 15$ by $- 1$ .

$y = - x^{5} + 15 x^{4} + \frac{90 x^{3}}{- 1} + \frac{- 270 x^{2}}{- 1} + \frac{405 x}{- 1} + \frac{- 251}{- 1}$

Move the negative one from the denominator of $\frac{90 x^{3}}{- 1}$ .

$y = - x^{5} + 15 x^{4} - 1 \cdot (90 x^{3}) + \frac{- 270 x^{2}}{- 1} + \frac{405 x}{- 1} + \frac{- 251}{- 1}$

Rewrite $- 1 \cdot (90 x^{3})$ as $- (90 x^{3})$ .

$y = - x^{5} + 15 x^{4} - (90 x^{3}) + \frac{- 270 x^{2}}{- 1} + \frac{405 x}{- 1} + \frac{- 251}{- 1}$

Multiply $90$ by $- 1$ .

$y = - x^{5} + 15 x^{4} - 90 x^{3} + \frac{- 270 x^{2}}{- 1} + \frac{405 x}{- 1} + \frac{- 251}{- 1}$

Move the negative one from the denominator of $\frac{- 270 x^{2}}{- 1}$ .

$y = - x^{5} + 15 x^{4} - 90 x^{3} - 1 \cdot (- 270 x^{2}) + \frac{405 x}{- 1} + \frac{- 251}{- 1}$

Rewrite $- 1 \cdot (- 270 x^{2})$ as $- (- 270 x^{2})$ .

$y = - x^{5} + 15 x^{4} - 90 x^{3} - (- 270 x^{2}) + \frac{405 x}{- 1} + \frac{- 251}{- 1}$

Multiply $- 270$ by $- 1$ .

$y = - x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} + \frac{405 x}{- 1} + \frac{- 251}{- 1}$

Move the negative one from the denominator of $\frac{405 x}{- 1}$ .

$y = - x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 1 \cdot (405 x) + \frac{- 251}{- 1}$

Rewrite $- 1 \cdot (405 x)$ as $- (405 x)$ .

$y = - x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - (405 x) + \frac{- 251}{- 1}$

Multiply $405$ by $- 1$ .

$y = - x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + \frac{- 251}{- 1}$

Divide $- 251$ by $- 1$ .

$y = - x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251$

Step 3

Replace $y$ with $f^{- 1} (x)$ to show the final answer.

$f^{- 1} (x) = - x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251$

Step 4

Verify if $f^{- 1} (x) = - x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251$ is the inverse of $f (x) = \sqrt[5]{8 - x} + 3$ .

To verify the inverse, check if $f^{- 1} (f (x)) = x$ and $f (f^{- 1} (x)) = x$ .

Evaluate $f^{- 1} (f (x))$ .

Set up the composite result function.

$f^{- 1} (f (x))$

Evaluate $f^{- 1} (\sqrt[5]{8 - x} + 3)$ by substituting in the value of $f$ into $f^{- 1}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - {(\sqrt[5]{8 - x} + 3)}^{5} + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Simplify each term.

Use the Binomial Theorem.

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - ({\sqrt[5]{8 - x}}^{5} + 5 {\sqrt[5]{8 - x}}^{4} \cdot 3 + 10 {\sqrt[5]{8 - x}}^{3} \cdot 3^{2} + 10 {\sqrt[5]{8 - x}}^{2} \cdot 3^{3} + 5 \sqrt[5]{8 - x} \cdot 3^{4} + 3^{5}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Simplify each term.

Rewrite ${\sqrt[5]{8 - x}}^{5}$ as $8 - x$ .

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[5]{8 - x}$ as ${(8 - x)}^{\frac{1}{5}}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - ({({(8 - x)}^{\frac{1}{5}})}^{5} + 5 {\sqrt[5]{8 - x}}^{4} \cdot 3 + 10 {\sqrt[5]{8 - x}}^{3} \cdot 3^{2} + 10 {\sqrt[5]{8 - x}}^{2} \cdot 3^{3} + 5 \sqrt[5]{8 - x} \cdot 3^{4} + 3^{5}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - ({(8 - x)}^{\frac{1}{5} \cdot 5} + 5 {\sqrt[5]{8 - x}}^{4} \cdot 3 + 10 {\sqrt[5]{8 - x}}^{3} \cdot 3^{2} + 10 {\sqrt[5]{8 - x}}^{2} \cdot 3^{3} + 5 \sqrt[5]{8 - x} \cdot 3^{4} + 3^{5}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Combine $\frac{1}{5}$ and $5$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - ({(8 - x)}^{\frac{5}{5}} + 5 {\sqrt[5]{8 - x}}^{4} \cdot 3 + 10 {\sqrt[5]{8 - x}}^{3} \cdot 3^{2} + 10 {\sqrt[5]{8 - x}}^{2} \cdot 3^{3} + 5 \sqrt[5]{8 - x} \cdot 3^{4} + 3^{5}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Cancel the common factor of $5$ .

Cancel the common factor.

Rewrite the expression.

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - ((8 - x) + 5 {\sqrt[5]{8 - x}}^{4} \cdot 3 + 10 {\sqrt[5]{8 - x}}^{3} \cdot 3^{2} + 10 {\sqrt[5]{8 - x}}^{2} \cdot 3^{3} + 5 \sqrt[5]{8 - x} \cdot 3^{4} + 3^{5}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Simplify.

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - (8 - x + 5 {\sqrt[5]{8 - x}}^{4} \cdot 3 + 10 {\sqrt[5]{8 - x}}^{3} \cdot 3^{2} + 10 {\sqrt[5]{8 - x}}^{2} \cdot 3^{3} + 5 \sqrt[5]{8 - x} \cdot 3^{4} + 3^{5}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Rewrite ${\sqrt[5]{8 - x}}^{4}$ as $\sqrt[5]{{(8 - x)}^{4}}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - (8 - x + 5 \sqrt[5]{{(8 - x)}^{4}} \cdot 3 + 10 {\sqrt[5]{8 - x}}^{3} \cdot 3^{2} + 10 {\sqrt[5]{8 - x}}^{2} \cdot 3^{3} + 5 \sqrt[5]{8 - x} \cdot 3^{4} + 3^{5}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $3$ by $5$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - (8 - x + 15 \sqrt[5]{{(8 - x)}^{4}} + 10 {\sqrt[5]{8 - x}}^{3} \cdot 3^{2} + 10 {\sqrt[5]{8 - x}}^{2} \cdot 3^{3} + 5 \sqrt[5]{8 - x} \cdot 3^{4} + 3^{5}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Rewrite ${\sqrt[5]{8 - x}}^{3}$ as $\sqrt[5]{{(8 - x)}^{3}}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - (8 - x + 15 \sqrt[5]{{(8 - x)}^{4}} + 10 \sqrt[5]{{(8 - x)}^{3}} \cdot 3^{2} + 10 {\sqrt[5]{8 - x}}^{2} \cdot 3^{3} + 5 \sqrt[5]{8 - x} \cdot 3^{4} + 3^{5}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Raise $3$ to the power of $2$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - (8 - x + 15 \sqrt[5]{{(8 - x)}^{4}} + 10 \sqrt[5]{{(8 - x)}^{3}} \cdot 9 + 10 {\sqrt[5]{8 - x}}^{2} \cdot 3^{3} + 5 \sqrt[5]{8 - x} \cdot 3^{4} + 3^{5}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $9$ by $10$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - (8 - x + 15 \sqrt[5]{{(8 - x)}^{4}} + 90 \sqrt[5]{{(8 - x)}^{3}} + 10 {\sqrt[5]{8 - x}}^{2} \cdot 3^{3} + 5 \sqrt[5]{8 - x} \cdot 3^{4} + 3^{5}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Rewrite ${\sqrt[5]{8 - x}}^{2}$ as $\sqrt[5]{{(8 - x)}^{2}}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - (8 - x + 15 \sqrt[5]{{(8 - x)}^{4}} + 90 \sqrt[5]{{(8 - x)}^{3}} + 10 \sqrt[5]{{(8 - x)}^{2}} \cdot 3^{3} + 5 \sqrt[5]{8 - x} \cdot 3^{4} + 3^{5}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Raise $3$ to the power of $3$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - (8 - x + 15 \sqrt[5]{{(8 - x)}^{4}} + 90 \sqrt[5]{{(8 - x)}^{3}} + 10 \sqrt[5]{{(8 - x)}^{2}} \cdot 27 + 5 \sqrt[5]{8 - x} \cdot 3^{4} + 3^{5}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $27$ by $10$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - (8 - x + 15 \sqrt[5]{{(8 - x)}^{4}} + 90 \sqrt[5]{{(8 - x)}^{3}} + 270 \sqrt[5]{{(8 - x)}^{2}} + 5 \sqrt[5]{8 - x} \cdot 3^{4} + 3^{5}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Raise $3$ to the power of $4$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - (8 - x + 15 \sqrt[5]{{(8 - x)}^{4}} + 90 \sqrt[5]{{(8 - x)}^{3}} + 270 \sqrt[5]{{(8 - x)}^{2}} + 5 \sqrt[5]{8 - x} \cdot 81 + 3^{5}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $81$ by $5$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - (8 - x + 15 \sqrt[5]{{(8 - x)}^{4}} + 90 \sqrt[5]{{(8 - x)}^{3}} + 270 \sqrt[5]{{(8 - x)}^{2}} + 405 \sqrt[5]{8 - x} + 3^{5}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Raise $3$ to the power of $5$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - (8 - x + 15 \sqrt[5]{{(8 - x)}^{4}} + 90 \sqrt[5]{{(8 - x)}^{3}} + 270 \sqrt[5]{{(8 - x)}^{2}} + 405 \sqrt[5]{8 - x} + 243) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Add $8$ and $243$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - (251 - x + 15 \sqrt[5]{{(8 - x)}^{4}} + 90 \sqrt[5]{{(8 - x)}^{3}} + 270 \sqrt[5]{{(8 - x)}^{2}} + 405 \sqrt[5]{8 - x}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Apply the distributive property.

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 1 \cdot 251 + x - (15 \sqrt[5]{{(8 - x)}^{4}}) - (90 \sqrt[5]{{(8 - x)}^{3}}) - (270 \sqrt[5]{{(8 - x)}^{2}}) - (405 \sqrt[5]{8 - x}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Simplify.

Multiply $- 1$ by $251$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - (15 \sqrt[5]{{(8 - x)}^{4}}) - (90 \sqrt[5]{{(8 - x)}^{3}}) - (270 \sqrt[5]{{(8 - x)}^{2}}) - (405 \sqrt[5]{8 - x}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $- - x$ .

Multiply $- 1$ by $- 1$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + 1 x - (15 \sqrt[5]{{(8 - x)}^{4}}) - (90 \sqrt[5]{{(8 - x)}^{3}}) - (270 \sqrt[5]{{(8 - x)}^{2}}) - (405 \sqrt[5]{8 - x}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $x$ by $1$ .

Multiply $15$ by $- 1$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - (90 \sqrt[5]{{(8 - x)}^{3}}) - (270 \sqrt[5]{{(8 - x)}^{2}}) - (405 \sqrt[5]{8 - x}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $90$ by $- 1$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - (270 \sqrt[5]{{(8 - x)}^{2}}) - (405 \sqrt[5]{8 - x}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $270$ by $- 1$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - (405 \sqrt[5]{8 - x}) + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $405$ by $- 1$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 {(\sqrt[5]{8 - x} + 3)}^{4} - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Use the Binomial Theorem.

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 ({\sqrt[5]{8 - x}}^{4} + 4 {\sqrt[5]{8 - x}}^{3} \cdot 3 + 6 {\sqrt[5]{8 - x}}^{2} \cdot 3^{2} + 4 \sqrt[5]{8 - x} \cdot 3^{3} + 3^{4}) - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Simplify each term.

Rewrite ${\sqrt[5]{8 - x}}^{4}$ as $\sqrt[5]{{(8 - x)}^{4}}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 (\sqrt[5]{{(8 - x)}^{4}} + 4 {\sqrt[5]{8 - x}}^{3} \cdot 3 + 6 {\sqrt[5]{8 - x}}^{2} \cdot 3^{2} + 4 \sqrt[5]{8 - x} \cdot 3^{3} + 3^{4}) - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Rewrite ${\sqrt[5]{8 - x}}^{3}$ as $\sqrt[5]{{(8 - x)}^{3}}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 (\sqrt[5]{{(8 - x)}^{4}} + 4 \sqrt[5]{{(8 - x)}^{3}} \cdot 3 + 6 {\sqrt[5]{8 - x}}^{2} \cdot 3^{2} + 4 \sqrt[5]{8 - x} \cdot 3^{3} + 3^{4}) - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $3$ by $4$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 (\sqrt[5]{{(8 - x)}^{4}} + 12 \sqrt[5]{{(8 - x)}^{3}} + 6 {\sqrt[5]{8 - x}}^{2} \cdot 3^{2} + 4 \sqrt[5]{8 - x} \cdot 3^{3} + 3^{4}) - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Rewrite ${\sqrt[5]{8 - x}}^{2}$ as $\sqrt[5]{{(8 - x)}^{2}}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 (\sqrt[5]{{(8 - x)}^{4}} + 12 \sqrt[5]{{(8 - x)}^{3}} + 6 \sqrt[5]{{(8 - x)}^{2}} \cdot 3^{2} + 4 \sqrt[5]{8 - x} \cdot 3^{3} + 3^{4}) - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Raise $3$ to the power of $2$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 (\sqrt[5]{{(8 - x)}^{4}} + 12 \sqrt[5]{{(8 - x)}^{3}} + 6 \sqrt[5]{{(8 - x)}^{2}} \cdot 9 + 4 \sqrt[5]{8 - x} \cdot 3^{3} + 3^{4}) - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $9$ by $6$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 (\sqrt[5]{{(8 - x)}^{4}} + 12 \sqrt[5]{{(8 - x)}^{3}} + 54 \sqrt[5]{{(8 - x)}^{2}} + 4 \sqrt[5]{8 - x} \cdot 3^{3} + 3^{4}) - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Raise $3$ to the power of $3$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 (\sqrt[5]{{(8 - x)}^{4}} + 12 \sqrt[5]{{(8 - x)}^{3}} + 54 \sqrt[5]{{(8 - x)}^{2}} + 4 \sqrt[5]{8 - x} \cdot 27 + 3^{4}) - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $27$ by $4$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 (\sqrt[5]{{(8 - x)}^{4}} + 12 \sqrt[5]{{(8 - x)}^{3}} + 54 \sqrt[5]{{(8 - x)}^{2}} + 108 \sqrt[5]{8 - x} + 3^{4}) - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Raise $3$ to the power of $4$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 (\sqrt[5]{{(8 - x)}^{4}} + 12 \sqrt[5]{{(8 - x)}^{3}} + 54 \sqrt[5]{{(8 - x)}^{2}} + 108 \sqrt[5]{8 - x} + 81) - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Apply the distributive property.

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 15 (12 \sqrt[5]{{(8 - x)}^{3}}) + 15 (54 \sqrt[5]{{(8 - x)}^{2}}) + 15 (108 \sqrt[5]{8 - x}) + 15 \cdot 81 - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Simplify.

Multiply $12$ by $15$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 15 (54 \sqrt[5]{{(8 - x)}^{2}}) + 15 (108 \sqrt[5]{8 - x}) + 15 \cdot 81 - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $54$ by $15$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 15 (108 \sqrt[5]{8 - x}) + 15 \cdot 81 - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $108$ by $15$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 15 \cdot 81 - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $15$ by $81$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 {(\sqrt[5]{8 - x} + 3)}^{3} + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Use the Binomial Theorem.

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 ({\sqrt[5]{8 - x}}^{3} + 3 {\sqrt[5]{8 - x}}^{2} \cdot 3 + 3 \sqrt[5]{8 - x} \cdot 3^{2} + 3^{3}) + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Simplify each term.

Rewrite ${\sqrt[5]{8 - x}}^{3}$ as $\sqrt[5]{{(8 - x)}^{3}}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 (\sqrt[5]{{(8 - x)}^{3}} + 3 {\sqrt[5]{8 - x}}^{2} \cdot 3 + 3 \sqrt[5]{8 - x} \cdot 3^{2} + 3^{3}) + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Rewrite ${\sqrt[5]{8 - x}}^{2}$ as $\sqrt[5]{{(8 - x)}^{2}}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 (\sqrt[5]{{(8 - x)}^{3}} + 3 \sqrt[5]{{(8 - x)}^{2}} \cdot 3 + 3 \sqrt[5]{8 - x} \cdot 3^{2} + 3^{3}) + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $3$ by $3$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 (\sqrt[5]{{(8 - x)}^{3}} + 9 \sqrt[5]{{(8 - x)}^{2}} + 3 \sqrt[5]{8 - x} \cdot 3^{2} + 3^{3}) + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $3$ by $3^{2}$ by adding the exponents.

Move $3^{2}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 (\sqrt[5]{{(8 - x)}^{3}} + 9 \sqrt[5]{{(8 - x)}^{2}} + 3^{2} \cdot (3 \sqrt[5]{8 - x}) + 3^{3}) + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $3^{2}$ by $3$ .

Raise $3$ to the power of $1$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 (\sqrt[5]{{(8 - x)}^{3}} + 9 \sqrt[5]{{(8 - x)}^{2}} + 3^{2} \cdot (3 \sqrt[5]{8 - x}) + 3^{3}) + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 (\sqrt[5]{{(8 - x)}^{3}} + 9 \sqrt[5]{{(8 - x)}^{2}} + 3^{2 + 1} \sqrt[5]{8 - x} + 3^{3}) + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Add $2$ and $1$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 (\sqrt[5]{{(8 - x)}^{3}} + 9 \sqrt[5]{{(8 - x)}^{2}} + 3^{3} \sqrt[5]{8 - x} + 3^{3}) + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Raise $3$ to the power of $3$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 (\sqrt[5]{{(8 - x)}^{3}} + 9 \sqrt[5]{{(8 - x)}^{2}} + 27 \sqrt[5]{8 - x} + 3^{3}) + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Raise $3$ to the power of $3$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 (\sqrt[5]{{(8 - x)}^{3}} + 9 \sqrt[5]{{(8 - x)}^{2}} + 27 \sqrt[5]{8 - x} + 27) + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Apply the distributive property.

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 90 (9 \sqrt[5]{{(8 - x)}^{2}}) - 90 (27 \sqrt[5]{8 - x}) - 90 \cdot 27 + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Simplify.

Multiply $9$ by $- 90$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 90 (27 \sqrt[5]{8 - x}) - 90 \cdot 27 + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $27$ by $- 90$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 90 \cdot 27 + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $- 90$ by $27$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 {(\sqrt[5]{8 - x} + 3)}^{2} - 405 (\sqrt[5]{8 - x} + 3) + 251$

Rewrite ${(\sqrt[5]{8 - x} + 3)}^{2}$ as $(\sqrt[5]{8 - x} + 3) (\sqrt[5]{8 - x} + 3)$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 ((\sqrt[5]{8 - x} + 3) (\sqrt[5]{8 - x} + 3)) - 405 (\sqrt[5]{8 - x} + 3) + 251$

Expand $(\sqrt[5]{8 - x} + 3) (\sqrt[5]{8 - x} + 3)$ using the FOIL Method.

Apply the distributive property.

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 (\sqrt[5]{8 - x} (\sqrt[5]{8 - x} + 3) + 3 (\sqrt[5]{8 - x} + 3)) - 405 (\sqrt[5]{8 - x} + 3) + 251$

Apply the distributive property.

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 (\sqrt[5]{8 - x} \sqrt[5]{8 - x} + \sqrt[5]{8 - x} \cdot 3 + 3 (\sqrt[5]{8 - x} + 3)) - 405 (\sqrt[5]{8 - x} + 3) + 251$

Apply the distributive property.

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 (\sqrt[5]{8 - x} \sqrt[5]{8 - x} + \sqrt[5]{8 - x} \cdot 3 + 3 \sqrt[5]{8 - x} + 3 \cdot 3) - 405 (\sqrt[5]{8 - x} + 3) + 251$

Simplify and combine like terms.

Simplify each term.

Multiply $\sqrt[5]{8 - x} \sqrt[5]{8 - x}$ .

Raise $\sqrt[5]{8 - x}$ to the power of $1$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 (\sqrt[5]{8 - x} \sqrt[5]{8 - x} + \sqrt[5]{8 - x} \cdot 3 + 3 \sqrt[5]{8 - x} + 3 \cdot 3) - 405 (\sqrt[5]{8 - x} + 3) + 251$

Raise $\sqrt[5]{8 - x}$ to the power of $1$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 (\sqrt[5]{8 - x} \sqrt[5]{8 - x} + \sqrt[5]{8 - x} \cdot 3 + 3 \sqrt[5]{8 - x} + 3 \cdot 3) - 405 (\sqrt[5]{8 - x} + 3) + 251$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 ({\sqrt[5]{8 - x}}^{1 + 1} + \sqrt[5]{8 - x} \cdot 3 + 3 \sqrt[5]{8 - x} + 3 \cdot 3) - 405 (\sqrt[5]{8 - x} + 3) + 251$

Add $1$ and $1$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 ({\sqrt[5]{8 - x}}^{2} + \sqrt[5]{8 - x} \cdot 3 + 3 \sqrt[5]{8 - x} + 3 \cdot 3) - 405 (\sqrt[5]{8 - x} + 3) + 251$

Rewrite ${\sqrt[5]{8 - x}}^{2}$ as $\sqrt[5]{{(8 - x)}^{2}}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 (\sqrt[5]{{(8 - x)}^{2}} + \sqrt[5]{8 - x} \cdot 3 + 3 \sqrt[5]{8 - x} + 3 \cdot 3) - 405 (\sqrt[5]{8 - x} + 3) + 251$

Move $3$ to the left of $\sqrt[5]{8 - x}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 (\sqrt[5]{{(8 - x)}^{2}} + 3 \cdot \sqrt[5]{8 - x} + 3 \sqrt[5]{8 - x} + 3 \cdot 3) - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $3$ by $3$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 (\sqrt[5]{{(8 - x)}^{2}} + 3 \sqrt[5]{8 - x} + 3 \sqrt[5]{8 - x} + 9) - 405 (\sqrt[5]{8 - x} + 3) + 251$

Add $3 \sqrt[5]{8 - x}$ and $3 \sqrt[5]{8 - x}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 (\sqrt[5]{{(8 - x)}^{2}} + 6 \sqrt[5]{8 - x} + 9) - 405 (\sqrt[5]{8 - x} + 3) + 251$

Apply the distributive property.

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 \sqrt[5]{{(8 - x)}^{2}} + 270 (6 \sqrt[5]{8 - x}) + 270 \cdot 9 - 405 (\sqrt[5]{8 - x} + 3) + 251$

Simplify.

Multiply $6$ by $270$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 270 \cdot 9 - 405 (\sqrt[5]{8 - x} + 3) + 251$

Multiply $270$ by $9$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 2430 - 405 (\sqrt[5]{8 - x} + 3) + 251$

Apply the distributive property.

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 2430 - 405 \sqrt[5]{8 - x} - 405 \cdot 3 + 251$

Multiply $- 405$ by $3$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 2430 - 405 \sqrt[5]{8 - x} - 1215 + 251$

Simplify by adding terms.

Combine the opposite terms in $- 251 + x - 15 \sqrt[5]{{(8 - x)}^{4}} - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 15 \sqrt[5]{{(8 - x)}^{4}} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 2430 - 405 \sqrt[5]{8 - x} - 1215 + 251$ .

Add $- 15 \sqrt[5]{{(8 - x)}^{4}}$ and $15 \sqrt[5]{{(8 - x)}^{4}}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x + 0 - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 2430 - 405 \sqrt[5]{8 - x} - 1215 + 251$

Add $- 251 + x$ and $0$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 180 \sqrt[5]{{(8 - x)}^{3}} + 810 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 810 \sqrt[5]{{(8 - x)}^{2}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 2430 - 405 \sqrt[5]{8 - x} - 1215 + 251$

Subtract $810 \sqrt[5]{{(8 - x)}^{2}}$ from $810 \sqrt[5]{{(8 - x)}^{2}}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 180 \sqrt[5]{{(8 - x)}^{3}} + 0 + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 2430 - 405 \sqrt[5]{8 - x} - 1215 + 251$

Add $- 251 + x - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 180 \sqrt[5]{{(8 - x)}^{3}}$ and $0$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 90 \sqrt[5]{{(8 - x)}^{3}} - 270 \sqrt[5]{{(8 - x)}^{2}} - 405 \sqrt[5]{8 - x} + 180 \sqrt[5]{{(8 - x)}^{3}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 2430 \sqrt[5]{8 - x} - 2430 + 270 \sqrt[5]{{(8 - x)}^{2}} + 1620 \sqrt[5]{8 - x} + 2430 - 405 \sqrt[5]{8 - x} - 1215 + 251$

Add $- 270 \sqrt[5]{{(8 - x)}^{2}}$ and $270 \sqrt[5]{{(8 - x)}^{2}}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 90 \sqrt[5]{{(8 - x)}^{3}} + 0 - 405 \sqrt[5]{8 - x} + 180 \sqrt[5]{{(8 - x)}^{3}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 2430 \sqrt[5]{8 - x} - 2430 + 1620 \sqrt[5]{8 - x} + 2430 - 405 \sqrt[5]{8 - x} - 1215 + 251$

Add $- 251 + x - 90 \sqrt[5]{{(8 - x)}^{3}}$ and $0$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 90 \sqrt[5]{{(8 - x)}^{3}} - 405 \sqrt[5]{8 - x} + 180 \sqrt[5]{{(8 - x)}^{3}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 2430 \sqrt[5]{8 - x} - 2430 + 1620 \sqrt[5]{8 - x} + 2430 - 405 \sqrt[5]{8 - x} - 1215 + 251$

Add $- 2430$ and $2430$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 90 \sqrt[5]{{(8 - x)}^{3}} - 405 \sqrt[5]{8 - x} + 180 \sqrt[5]{{(8 - x)}^{3}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 2430 \sqrt[5]{8 - x} + 0 + 1620 \sqrt[5]{8 - x} - 405 \sqrt[5]{8 - x} - 1215 + 251$

Add $- 251 + x - 90 \sqrt[5]{{(8 - x)}^{3}} - 405 \sqrt[5]{8 - x} + 180 \sqrt[5]{{(8 - x)}^{3}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 2430 \sqrt[5]{8 - x}$ and $0$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 90 \sqrt[5]{{(8 - x)}^{3}} - 405 \sqrt[5]{8 - x} + 180 \sqrt[5]{{(8 - x)}^{3}} + 1620 \sqrt[5]{8 - x} + 1215 - 90 \sqrt[5]{{(8 - x)}^{3}} - 2430 \sqrt[5]{8 - x} + 1620 \sqrt[5]{8 - x} - 405 \sqrt[5]{8 - x} - 1215 + 251$

Subtract $1215$ from $1215$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 90 \sqrt[5]{{(8 - x)}^{3}} - 405 \sqrt[5]{8 - x} + 180 \sqrt[5]{{(8 - x)}^{3}} + 1620 \sqrt[5]{8 - x} + 0 - 90 \sqrt[5]{{(8 - x)}^{3}} - 2430 \sqrt[5]{8 - x} + 1620 \sqrt[5]{8 - x} - 405 \sqrt[5]{8 - x} + 251$

Add $- 251 + x - 90 \sqrt[5]{{(8 - x)}^{3}} - 405 \sqrt[5]{8 - x} + 180 \sqrt[5]{{(8 - x)}^{3}} + 1620 \sqrt[5]{8 - x}$ and $0$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = - 251 + x - 90 \sqrt[5]{{(8 - x)}^{3}} - 405 \sqrt[5]{8 - x} + 180 \sqrt[5]{{(8 - x)}^{3}} + 1620 \sqrt[5]{8 - x} - 90 \sqrt[5]{{(8 - x)}^{3}} - 2430 \sqrt[5]{8 - x} + 1620 \sqrt[5]{8 - x} - 405 \sqrt[5]{8 - x} + 251$

Add $- 251$ and $251$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = 0 + x - 90 \sqrt[5]{{(8 - x)}^{3}} - 405 \sqrt[5]{8 - x} + 180 \sqrt[5]{{(8 - x)}^{3}} + 1620 \sqrt[5]{8 - x} - 90 \sqrt[5]{{(8 - x)}^{3}} - 2430 \sqrt[5]{8 - x} + 1620 \sqrt[5]{8 - x} - 405 \sqrt[5]{8 - x}$

Add $0$ and $x$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = x - 90 \sqrt[5]{{(8 - x)}^{3}} - 405 \sqrt[5]{8 - x} + 180 \sqrt[5]{{(8 - x)}^{3}} + 1620 \sqrt[5]{8 - x} - 90 \sqrt[5]{{(8 - x)}^{3}} - 2430 \sqrt[5]{8 - x} + 1620 \sqrt[5]{8 - x} - 405 \sqrt[5]{8 - x}$

Add $- 90 \sqrt[5]{{(8 - x)}^{3}}$ and $180 \sqrt[5]{{(8 - x)}^{3}}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = x + 90 \sqrt[5]{{(8 - x)}^{3}} - 405 \sqrt[5]{8 - x} + 1620 \sqrt[5]{8 - x} - 90 \sqrt[5]{{(8 - x)}^{3}} - 2430 \sqrt[5]{8 - x} + 1620 \sqrt[5]{8 - x} - 405 \sqrt[5]{8 - x}$

Combine the opposite terms in $x + 90 \sqrt[5]{{(8 - x)}^{3}} - 405 \sqrt[5]{8 - x} + 1620 \sqrt[5]{8 - x} - 90 \sqrt[5]{{(8 - x)}^{3}} - 2430 \sqrt[5]{8 - x} + 1620 \sqrt[5]{8 - x} - 405 \sqrt[5]{8 - x}$ .

Subtract $90 \sqrt[5]{{(8 - x)}^{3}}$ from $90 \sqrt[5]{{(8 - x)}^{3}}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = x + 0 - 405 \sqrt[5]{8 - x} + 1620 \sqrt[5]{8 - x} - 2430 \sqrt[5]{8 - x} + 1620 \sqrt[5]{8 - x} - 405 \sqrt[5]{8 - x}$

Add $x$ and $0$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = x - 405 \sqrt[5]{8 - x} + 1620 \sqrt[5]{8 - x} - 2430 \sqrt[5]{8 - x} + 1620 \sqrt[5]{8 - x} - 405 \sqrt[5]{8 - x}$

Add $- 405 \sqrt[5]{8 - x}$ and $1620 \sqrt[5]{8 - x}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = x + 1215 \sqrt[5]{8 - x} - 2430 \sqrt[5]{8 - x} + 1620 \sqrt[5]{8 - x} - 405 \sqrt[5]{8 - x}$

Subtract $2430 \sqrt[5]{8 - x}$ from $1215 \sqrt[5]{8 - x}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = x - 1215 \sqrt[5]{8 - x} + 1620 \sqrt[5]{8 - x} - 405 \sqrt[5]{8 - x}$

Add $- 1215 \sqrt[5]{8 - x}$ and $1620 \sqrt[5]{8 - x}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = x + 405 \sqrt[5]{8 - x} - 405 \sqrt[5]{8 - x}$

Combine the opposite terms in $x + 405 \sqrt[5]{8 - x} - 405 \sqrt[5]{8 - x}$ .

Subtract $405 \sqrt[5]{8 - x}$ from $405 \sqrt[5]{8 - x}$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = x + 0$

Add $x$ and $0$ .

$f^{- 1} (\sqrt[5]{8 - x} + 3) = x$

Evaluate $f (f^{- 1} (x))$ .

Set up the composite result function.

$f (f^{- 1} (x))$

Evaluate $f (- x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251)$ by substituting in the value of $f^{- 1}$ into $f$ .

$f (- x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251) = \sqrt[5]{8 - (- x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251)} + 3$

Simplify each term.

Apply the distributive property.

$f (- x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251) = \sqrt[5]{8 + x^{5} - (15 x^{4}) - (- 90 x^{3}) - (270 x^{2}) - (- 405 x) - 1 \cdot 251} + 3$

Simplify.

Multiply $- - x^{5}$ .

Multiply $- 1$ by $- 1$ .

$f (- x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251) = \sqrt[5]{8 + 1 x^{5} - (15 x^{4}) - (- 90 x^{3}) - (270 x^{2}) - (- 405 x) - 1 \cdot 251} + 3$

Multiply $x^{5}$ by $1$ .

$f (- x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251) = \sqrt[5]{8 + x^{5} - (15 x^{4}) - (- 90 x^{3}) - (270 x^{2}) - (- 405 x) - 1 \cdot 251} + 3$

Multiply $15$ by $- 1$ .

$f (- x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251) = \sqrt[5]{8 + x^{5} - 15 x^{4} - (- 90 x^{3}) - (270 x^{2}) - (- 405 x) - 1 \cdot 251} + 3$

Multiply $- 90$ by $- 1$ .

$f (- x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251) = \sqrt[5]{8 + x^{5} - 15 x^{4} + 90 x^{3} - (270 x^{2}) - (- 405 x) - 1 \cdot 251} + 3$

Multiply $270$ by $- 1$ .

$f (- x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251) = \sqrt[5]{8 + x^{5} - 15 x^{4} + 90 x^{3} - 270 x^{2} - (- 405 x) - 1 \cdot 251} + 3$

Multiply $- 405$ by $- 1$ .

$f (- x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251) = \sqrt[5]{8 + x^{5} - 15 x^{4} + 90 x^{3} - 270 x^{2} + 405 x - 1 \cdot 251} + 3$

Multiply $- 1$ by $251$ .

$f (- x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251) = \sqrt[5]{8 + x^{5} - 15 x^{4} + 90 x^{3} - 270 x^{2} + 405 x - 251} + 3$

Subtract $251$ from $8$ .

$f (- x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251) = \sqrt[5]{x^{5} - 15 x^{4} + 90 x^{3} - 270 x^{2} + 405 x - 243} + 3$

Rewrite $x^{5} - 15 x^{4} + 90 x^{3} - 270 x^{2} + 405 x - 243$ in a factored form.

Make each term match the terms from the binomial theorem formula.

$f (- x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251) = \sqrt[5]{x^{5} - 5 \cdot (3 x^{4}) + 10 \cdot (3^{2} x^{3}) - 10 \cdot (3^{3} x^{2}) + 5 \cdot (3^{4} x) - 1 \cdot 3^{5}} + 3$

Factor $x^{5} - 5 \cdot 3 x^{4} + 10 \cdot 3^{2} x^{3} - 10 \cdot 3^{3} x^{2} + 5 \cdot 3^{4} x - 1 \cdot 3^{5}$ using the binomial theorem.

$f (- x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251) = \sqrt[5]{{(x - 3)}^{5}} + 3$

Pull terms out from under the radical, assuming real numbers.

$f (- x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251) = x - 3 + 3$

Combine the opposite terms in $x - 3 + 3$ .

Add $- 3$ and $3$ .

$f (- x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251) = x + 0$

Add $x$ and $0$ .

$f (- x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251) = x$

Since $f^{- 1} (f (x)) = x$ and $f (f^{- 1} (x)) = x$ , then $f^{- 1} (x) = - x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251$ is the inverse of $f (x) = \sqrt[5]{8 - x} + 3$ .

$f^{- 1} (x) = - x^{5} + 15 x^{4} - 90 x^{3} + 270 x^{2} - 405 x + 251$

Find the Inverse fifth root of 8-x+3

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