Find the Inverse x^(1/5)+7

$x^{\frac{1}{5}} + 7$

Step 1

Interchange the variables.

$x = y^{\frac{1}{5}} + 7$

Step 2

Solve for $y$ .

Rewrite the equation as $y^{\frac{1}{5}} + 7 = x$ .

$y^{\frac{1}{5}} + 7 = x$

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

Subtract $7$ from both sides of the equation.

$y^{\frac{1}{5}} - x = - 7$

Add $x$ to both sides of the equation.

$y^{\frac{1}{5}} = - 7 + x$

Raise each side of the equation to the power of $5$ to eliminate the fractional exponent on the left side.

${(y^{\frac{1}{5}})}^{5} = {(- 7 + x)}^{5}$

Simplify the exponent.

Simplify the left side.

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

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

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

$y^{\frac{1}{5} \cdot 5} = {(- 7 + x)}^{5}$

Cancel the common factor of $5$ .

Cancel the common factor.

$y^{\frac{1}{5} \cdot 5} = {(- 7 + x)}^{5}$

Rewrite the expression.

$y^{1} = {(- 7 + x)}^{5}$

Simplify.

$y = {(- 7 + x)}^{5}$

Simplify the right side.

Simplify ${(- 7 + x)}^{5}$ .

Use the Binomial Theorem.

$y = {(- 7)}^{5} + 5 {(- 7)}^{4} x + 10 {(- 7)}^{3} x^{2} + 10 {(- 7)}^{2} x^{3} + 5 \cdot - 7 x^{4} + x^{5}$

Simplify each term.

Raise $- 7$ to the power of $5$ .

$y = - 16807 + 5 {(- 7)}^{4} x + 10 {(- 7)}^{3} x^{2} + 10 {(- 7)}^{2} x^{3} + 5 \cdot - 7 x^{4} + x^{5}$

Raise $- 7$ to the power of $4$ .

$y = - 16807 + 5 \cdot 2401 x + 10 {(- 7)}^{3} x^{2} + 10 {(- 7)}^{2} x^{3} + 5 \cdot - 7 x^{4} + x^{5}$

Multiply $5$ by $2401$ .

$y = - 16807 + 12005 x + 10 {(- 7)}^{3} x^{2} + 10 {(- 7)}^{2} x^{3} + 5 \cdot - 7 x^{4} + x^{5}$

Raise $- 7$ to the power of $3$ .

$y = - 16807 + 12005 x + 10 \cdot - 343 x^{2} + 10 {(- 7)}^{2} x^{3} + 5 \cdot - 7 x^{4} + x^{5}$

Multiply $10$ by $- 343$ .

$y = - 16807 + 12005 x - 3430 x^{2} + 10 {(- 7)}^{2} x^{3} + 5 \cdot - 7 x^{4} + x^{5}$

Raise $- 7$ to the power of $2$ .

$y = - 16807 + 12005 x - 3430 x^{2} + 10 \cdot 49 x^{3} + 5 \cdot - 7 x^{4} + x^{5}$

Multiply $10$ by $49$ .

$y = - 16807 + 12005 x - 3430 x^{2} + 490 x^{3} + 5 \cdot - 7 x^{4} + x^{5}$

Multiply $5$ by $- 7$ .

$y = - 16807 + 12005 x - 3430 x^{2} + 490 x^{3} - 35 x^{4} + x^{5}$

Simplify $- 16807 + 12005 x - 3430 x^{2} + 490 x^{3} - 35 x^{4} + x^{5}$ .

Move $- 16807$ .

$y = 12005 x - 3430 x^{2} + 490 x^{3} - 35 x^{4} + x^{5} - 16807$

Move $12005 x$ .

$y = - 3430 x^{2} + 490 x^{3} - 35 x^{4} + x^{5} + 12005 x - 16807$

Move $- 3430 x^{2}$ .

$y = 490 x^{3} - 35 x^{4} + x^{5} - 3430 x^{2} + 12005 x - 16807$

Move $490 x^{3}$ .

$y = - 35 x^{4} + x^{5} + 490 x^{3} - 3430 x^{2} + 12005 x - 16807$

Reorder $- 35 x^{4}$ and $x^{5}$ .

$y = x^{5} - 35 x^{4} + 490 x^{3} - 3430 x^{2} + 12005 x - 16807$

Step 3

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

$f^{- 1} (x) = x^{5} - 35 x^{4} + 490 x^{3} - 3430 x^{2} + 12005 x - 16807$

Step 4

Verify if $f^{- 1} (x) = x^{5} - 35 x^{4} + 490 x^{3} - 3430 x^{2} + 12005 x - 16807$ is the inverse of $f (x) = x^{\frac{1}{5}} + 7$ .

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 $f^{- 1} (x^{\frac{1}{5}} + 7)$ by substituting in the value of $f$ into $f^{- 1}$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = {(x^{\frac{1}{5}} + 7)}^{5} - 35 {(x^{\frac{1}{5}} + 7)}^{4} + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Simplify each term.

Use the Binomial Theorem.

$f^{- 1} (x^{\frac{1}{5}} + 7) = {(x^{\frac{1}{5}})}^{5} + 5 {(x^{\frac{1}{5}})}^{4} \cdot 7 + 10 {(x^{\frac{1}{5}})}^{3} \cdot 7^{2} + 10 {(x^{\frac{1}{5}})}^{2} \cdot 7^{3} + 5 x^{\frac{1}{5}} \cdot 7^{4} + 7^{5} - 35 {(x^{\frac{1}{5}} + 7)}^{4} + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Simplify each term.

Multiply the exponents in ${(x^{\frac{1}{5}})}^{5}$ .

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

$f^{- 1} (x^{\frac{1}{5}} + 7) = x^{\frac{1}{5} \cdot 5} + 5 {(x^{\frac{1}{5}})}^{4} \cdot 7 + 10 {(x^{\frac{1}{5}})}^{3} \cdot 7^{2} + 10 {(x^{\frac{1}{5}})}^{2} \cdot 7^{3} + 5 x^{\frac{1}{5}} \cdot 7^{4} + 7^{5} - 35 {(x^{\frac{1}{5}} + 7)}^{4} + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Cancel the common factor of $5$ .

Cancel the common factor.

Rewrite the expression.

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 5 {(x^{\frac{1}{5}})}^{4} \cdot 7 + 10 {(x^{\frac{1}{5}})}^{3} \cdot 7^{2} + 10 {(x^{\frac{1}{5}})}^{2} \cdot 7^{3} + 5 x^{\frac{1}{5}} \cdot 7^{4} + 7^{5} - 35 {(x^{\frac{1}{5}} + 7)}^{4} + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Simplify.

Multiply the exponents in ${(x^{\frac{1}{5}})}^{4}$ .

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

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 5 x^{\frac{1}{5} \cdot 4} \cdot 7 + 10 {(x^{\frac{1}{5}})}^{3} \cdot 7^{2} + 10 {(x^{\frac{1}{5}})}^{2} \cdot 7^{3} + 5 x^{\frac{1}{5}} \cdot 7^{4} + 7^{5} - 35 {(x^{\frac{1}{5}} + 7)}^{4} + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Combine $\frac{1}{5}$ and $4$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 5 x^{\frac{4}{5}} \cdot 7 + 10 {(x^{\frac{1}{5}})}^{3} \cdot 7^{2} + 10 {(x^{\frac{1}{5}})}^{2} \cdot 7^{3} + 5 x^{\frac{1}{5}} \cdot 7^{4} + 7^{5} - 35 {(x^{\frac{1}{5}} + 7)}^{4} + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply $7$ by $5$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 10 {(x^{\frac{1}{5}})}^{3} \cdot 7^{2} + 10 {(x^{\frac{1}{5}})}^{2} \cdot 7^{3} + 5 x^{\frac{1}{5}} \cdot 7^{4} + 7^{5} - 35 {(x^{\frac{1}{5}} + 7)}^{4} + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply the exponents in ${(x^{\frac{1}{5}})}^{3}$ .

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

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 10 x^{\frac{1}{5} \cdot 3} \cdot 7^{2} + 10 {(x^{\frac{1}{5}})}^{2} \cdot 7^{3} + 5 x^{\frac{1}{5}} \cdot 7^{4} + 7^{5} - 35 {(x^{\frac{1}{5}} + 7)}^{4} + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Combine $\frac{1}{5}$ and $3$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 10 x^{\frac{3}{5}} \cdot 7^{2} + 10 {(x^{\frac{1}{5}})}^{2} \cdot 7^{3} + 5 x^{\frac{1}{5}} \cdot 7^{4} + 7^{5} - 35 {(x^{\frac{1}{5}} + 7)}^{4} + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Raise $7$ to the power of $2$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 10 x^{\frac{3}{5}} \cdot 49 + 10 {(x^{\frac{1}{5}})}^{2} \cdot 7^{3} + 5 x^{\frac{1}{5}} \cdot 7^{4} + 7^{5} - 35 {(x^{\frac{1}{5}} + 7)}^{4} + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply $49$ by $10$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 10 {(x^{\frac{1}{5}})}^{2} \cdot 7^{3} + 5 x^{\frac{1}{5}} \cdot 7^{4} + 7^{5} - 35 {(x^{\frac{1}{5}} + 7)}^{4} + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply the exponents in ${(x^{\frac{1}{5}})}^{2}$ .

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

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 10 x^{\frac{1}{5} \cdot 2} \cdot 7^{3} + 5 x^{\frac{1}{5}} \cdot 7^{4} + 7^{5} - 35 {(x^{\frac{1}{5}} + 7)}^{4} + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Combine $\frac{1}{5}$ and $2$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 10 x^{\frac{2}{5}} \cdot 7^{3} + 5 x^{\frac{1}{5}} \cdot 7^{4} + 7^{5} - 35 {(x^{\frac{1}{5}} + 7)}^{4} + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Raise $7$ to the power of $3$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 10 x^{\frac{2}{5}} \cdot 343 + 5 x^{\frac{1}{5}} \cdot 7^{4} + 7^{5} - 35 {(x^{\frac{1}{5}} + 7)}^{4} + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply $343$ by $10$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 5 x^{\frac{1}{5}} \cdot 7^{4} + 7^{5} - 35 {(x^{\frac{1}{5}} + 7)}^{4} + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Raise $7$ to the power of $4$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 5 x^{\frac{1}{5}} \cdot 2401 + 7^{5} - 35 {(x^{\frac{1}{5}} + 7)}^{4} + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply $2401$ by $5$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 7^{5} - 35 {(x^{\frac{1}{5}} + 7)}^{4} + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Raise $7$ to the power of $5$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 {(x^{\frac{1}{5}} + 7)}^{4} + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Use the Binomial Theorem.

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 ({(x^{\frac{1}{5}})}^{4} + 4 {(x^{\frac{1}{5}})}^{3} \cdot 7 + 6 {(x^{\frac{1}{5}})}^{2} \cdot 7^{2} + 4 x^{\frac{1}{5}} \cdot 7^{3} + 7^{4}) + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Simplify each term.

Multiply the exponents in ${(x^{\frac{1}{5}})}^{4}$ .

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

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 (x^{\frac{1}{5} \cdot 4} + 4 {(x^{\frac{1}{5}})}^{3} \cdot 7 + 6 {(x^{\frac{1}{5}})}^{2} \cdot 7^{2} + 4 x^{\frac{1}{5}} \cdot 7^{3} + 7^{4}) + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Combine $\frac{1}{5}$ and $4$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 (x^{\frac{4}{5}} + 4 {(x^{\frac{1}{5}})}^{3} \cdot 7 + 6 {(x^{\frac{1}{5}})}^{2} \cdot 7^{2} + 4 x^{\frac{1}{5}} \cdot 7^{3} + 7^{4}) + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply the exponents in ${(x^{\frac{1}{5}})}^{3}$ .

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

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 (x^{\frac{4}{5}} + 4 x^{\frac{1}{5} \cdot 3} \cdot 7 + 6 {(x^{\frac{1}{5}})}^{2} \cdot 7^{2} + 4 x^{\frac{1}{5}} \cdot 7^{3} + 7^{4}) + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Combine $\frac{1}{5}$ and $3$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 (x^{\frac{4}{5}} + 4 x^{\frac{3}{5}} \cdot 7 + 6 {(x^{\frac{1}{5}})}^{2} \cdot 7^{2} + 4 x^{\frac{1}{5}} \cdot 7^{3} + 7^{4}) + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply $7$ by $4$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 (x^{\frac{4}{5}} + 28 x^{\frac{3}{5}} + 6 {(x^{\frac{1}{5}})}^{2} \cdot 7^{2} + 4 x^{\frac{1}{5}} \cdot 7^{3} + 7^{4}) + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply the exponents in ${(x^{\frac{1}{5}})}^{2}$ .

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

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 (x^{\frac{4}{5}} + 28 x^{\frac{3}{5}} + 6 x^{\frac{1}{5} \cdot 2} \cdot 7^{2} + 4 x^{\frac{1}{5}} \cdot 7^{3} + 7^{4}) + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Combine $\frac{1}{5}$ and $2$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 (x^{\frac{4}{5}} + 28 x^{\frac{3}{5}} + 6 x^{\frac{2}{5}} \cdot 7^{2} + 4 x^{\frac{1}{5}} \cdot 7^{3} + 7^{4}) + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Raise $7$ to the power of $2$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 (x^{\frac{4}{5}} + 28 x^{\frac{3}{5}} + 6 x^{\frac{2}{5}} \cdot 49 + 4 x^{\frac{1}{5}} \cdot 7^{3} + 7^{4}) + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply $49$ by $6$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 (x^{\frac{4}{5}} + 28 x^{\frac{3}{5}} + 294 x^{\frac{2}{5}} + 4 x^{\frac{1}{5}} \cdot 7^{3} + 7^{4}) + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Raise $7$ to the power of $3$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 (x^{\frac{4}{5}} + 28 x^{\frac{3}{5}} + 294 x^{\frac{2}{5}} + 4 x^{\frac{1}{5}} \cdot 343 + 7^{4}) + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply $343$ by $4$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 (x^{\frac{4}{5}} + 28 x^{\frac{3}{5}} + 294 x^{\frac{2}{5}} + 1372 x^{\frac{1}{5}} + 7^{4}) + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Raise $7$ to the power of $4$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 (x^{\frac{4}{5}} + 28 x^{\frac{3}{5}} + 294 x^{\frac{2}{5}} + 1372 x^{\frac{1}{5}} + 2401) + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Apply the distributive property.

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 35 (28 x^{\frac{3}{5}}) - 35 (294 x^{\frac{2}{5}}) - 35 (1372 x^{\frac{1}{5}}) - 35 \cdot 2401 + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Simplify.

Multiply $28$ by $- 35$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 35 (294 x^{\frac{2}{5}}) - 35 (1372 x^{\frac{1}{5}}) - 35 \cdot 2401 + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply $294$ by $- 35$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 35 (1372 x^{\frac{1}{5}}) - 35 \cdot 2401 + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply $1372$ by $- 35$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 35 \cdot 2401 + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply $- 35$ by $2401$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 {(x^{\frac{1}{5}} + 7)}^{3} - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Use the Binomial Theorem.

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 ({(x^{\frac{1}{5}})}^{3} + 3 {(x^{\frac{1}{5}})}^{2} \cdot 7 + 3 x^{\frac{1}{5}} \cdot 7^{2} + 7^{3}) - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Simplify each term.

Multiply the exponents in ${(x^{\frac{1}{5}})}^{3}$ .

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

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 (x^{\frac{1}{5} \cdot 3} + 3 {(x^{\frac{1}{5}})}^{2} \cdot 7 + 3 x^{\frac{1}{5}} \cdot 7^{2} + 7^{3}) - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Combine $\frac{1}{5}$ and $3$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 (x^{\frac{3}{5}} + 3 {(x^{\frac{1}{5}})}^{2} \cdot 7 + 3 x^{\frac{1}{5}} \cdot 7^{2} + 7^{3}) - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply the exponents in ${(x^{\frac{1}{5}})}^{2}$ .

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

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 (x^{\frac{3}{5}} + 3 x^{\frac{1}{5} \cdot 2} \cdot 7 + 3 x^{\frac{1}{5}} \cdot 7^{2} + 7^{3}) - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Combine $\frac{1}{5}$ and $2$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 (x^{\frac{3}{5}} + 3 x^{\frac{2}{5}} \cdot 7 + 3 x^{\frac{1}{5}} \cdot 7^{2} + 7^{3}) - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply $7$ by $3$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 (x^{\frac{3}{5}} + 21 x^{\frac{2}{5}} + 3 x^{\frac{1}{5}} \cdot 7^{2} + 7^{3}) - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Raise $7$ to the power of $2$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 (x^{\frac{3}{5}} + 21 x^{\frac{2}{5}} + 3 x^{\frac{1}{5}} \cdot 49 + 7^{3}) - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply $49$ by $3$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 (x^{\frac{3}{5}} + 21 x^{\frac{2}{5}} + 147 x^{\frac{1}{5}} + 7^{3}) - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Raise $7$ to the power of $3$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 (x^{\frac{3}{5}} + 21 x^{\frac{2}{5}} + 147 x^{\frac{1}{5}} + 343) - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Apply the distributive property.

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 490 (21 x^{\frac{2}{5}}) + 490 (147 x^{\frac{1}{5}}) + 490 \cdot 343 - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Simplify.

Multiply $21$ by $490$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 490 (147 x^{\frac{1}{5}}) + 490 \cdot 343 - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply $147$ by $490$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 490 \cdot 343 - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply $490$ by $343$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 {(x^{\frac{1}{5}} + 7)}^{2} + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Rewrite ${(x^{\frac{1}{5}} + 7)}^{2}$ as $(x^{\frac{1}{5}} + 7) (x^{\frac{1}{5}} + 7)$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 ((x^{\frac{1}{5}} + 7) (x^{\frac{1}{5}} + 7)) + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Expand $(x^{\frac{1}{5}} + 7) (x^{\frac{1}{5}} + 7)$ using the FOIL Method.

Apply the distributive property.

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 (x^{\frac{1}{5}} (x^{\frac{1}{5}} + 7) + 7 (x^{\frac{1}{5}} + 7)) + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Apply the distributive property.

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 (x^{\frac{1}{5}} x^{\frac{1}{5}} + x^{\frac{1}{5}} \cdot 7 + 7 (x^{\frac{1}{5}} + 7)) + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Apply the distributive property.

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 (x^{\frac{1}{5}} x^{\frac{1}{5}} + x^{\frac{1}{5}} \cdot 7 + 7 x^{\frac{1}{5}} + 7 \cdot 7) + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Simplify and combine like terms.

Simplify each term.

Multiply $x^{\frac{1}{5}}$ by $x^{\frac{1}{5}}$ by adding the exponents.

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

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 (x^{\frac{1}{5} + \frac{1}{5}} + x^{\frac{1}{5}} \cdot 7 + 7 x^{\frac{1}{5}} + 7 \cdot 7) + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Combine the numerators over the common denominator.

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 (x^{\frac{1 + 1}{5}} + x^{\frac{1}{5}} \cdot 7 + 7 x^{\frac{1}{5}} + 7 \cdot 7) + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Add $1$ and $1$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 (x^{\frac{2}{5}} + x^{\frac{1}{5}} \cdot 7 + 7 x^{\frac{1}{5}} + 7 \cdot 7) + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Move $7$ to the left of $x^{\frac{1}{5}}$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 (x^{\frac{2}{5}} + 7 \cdot x^{\frac{1}{5}} + 7 x^{\frac{1}{5}} + 7 \cdot 7) + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply $7$ by $7$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 (x^{\frac{2}{5}} + 7 x^{\frac{1}{5}} + 7 x^{\frac{1}{5}} + 49) + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Add $7 x^{\frac{1}{5}}$ and $7 x^{\frac{1}{5}}$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 (x^{\frac{2}{5}} + 14 x^{\frac{1}{5}} + 49) + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Apply the distributive property.

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 x^{\frac{2}{5}} - 3430 (14 x^{\frac{1}{5}}) - 3430 \cdot 49 + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Simplify.

Multiply $14$ by $- 3430$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 3430 \cdot 49 + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Multiply $- 3430$ by $49$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 168070 + 12005 (x^{\frac{1}{5}} + 7) - 16807$

Apply the distributive property.

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 168070 + 12005 x^{\frac{1}{5}} + 12005 \cdot 7 - 16807$

Multiply $12005$ by $7$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 168070 + 12005 x^{\frac{1}{5}} + 84035 - 16807$

Simplify by adding terms.

Combine the opposite terms in $x + 35 x^{\frac{4}{5}} + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 35 x^{\frac{4}{5}} - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 168070 + 12005 x^{\frac{1}{5}} + 84035 - 16807$ .

Subtract $35 x^{\frac{4}{5}}$ from $35 x^{\frac{4}{5}}$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 + 0 - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 168070 + 12005 x^{\frac{1}{5}} + 84035 - 16807$

Add $x + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807$ and $0$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 980 x^{\frac{3}{5}} - 10290 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 10290 x^{\frac{2}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 168070 + 12005 x^{\frac{1}{5}} + 84035 - 16807$

Add $- 10290 x^{\frac{2}{5}}$ and $10290 x^{\frac{2}{5}}$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 980 x^{\frac{3}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 0 + 72030 x^{\frac{1}{5}} + 168070 - 3430 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 168070 + 12005 x^{\frac{1}{5}} + 84035 - 16807$

Add $x + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 980 x^{\frac{3}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}}$ and $0$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 490 x^{\frac{3}{5}} + 3430 x^{\frac{2}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 980 x^{\frac{3}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 3430 x^{\frac{2}{5}} - 48020 x^{\frac{1}{5}} - 168070 + 12005 x^{\frac{1}{5}} + 84035 - 16807$

Subtract $3430 x^{\frac{2}{5}}$ from $3430 x^{\frac{2}{5}}$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 490 x^{\frac{3}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 980 x^{\frac{3}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 72030 x^{\frac{1}{5}} + 168070 + 0 - 48020 x^{\frac{1}{5}} - 168070 + 12005 x^{\frac{1}{5}} + 84035 - 16807$

Add $x + 490 x^{\frac{3}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 980 x^{\frac{3}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 72030 x^{\frac{1}{5}} + 168070$ and $0$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 490 x^{\frac{3}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 980 x^{\frac{3}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 72030 x^{\frac{1}{5}} + 168070 - 48020 x^{\frac{1}{5}} - 168070 + 12005 x^{\frac{1}{5}} + 84035 - 16807$

Subtract $168070$ from $168070$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 490 x^{\frac{3}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 980 x^{\frac{3}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 72030 x^{\frac{1}{5}} - 48020 x^{\frac{1}{5}} + 0 + 12005 x^{\frac{1}{5}} + 84035 - 16807$

Add $x + 490 x^{\frac{3}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 980 x^{\frac{3}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 72030 x^{\frac{1}{5}} - 48020 x^{\frac{1}{5}}$ and $0$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 490 x^{\frac{3}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 980 x^{\frac{3}{5}} - 48020 x^{\frac{1}{5}} - 84035 + 490 x^{\frac{3}{5}} + 72030 x^{\frac{1}{5}} - 48020 x^{\frac{1}{5}} + 12005 x^{\frac{1}{5}} + 84035 - 16807$

Add $- 84035$ and $84035$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 490 x^{\frac{3}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 980 x^{\frac{3}{5}} - 48020 x^{\frac{1}{5}} + 490 x^{\frac{3}{5}} + 72030 x^{\frac{1}{5}} - 48020 x^{\frac{1}{5}} + 12005 x^{\frac{1}{5}} + 0 - 16807$

Add $x + 490 x^{\frac{3}{5}} + 12005 x^{\frac{1}{5}} + 16807 - 980 x^{\frac{3}{5}} - 48020 x^{\frac{1}{5}} + 490 x^{\frac{3}{5}} + 72030 x^{\frac{1}{5}} - 48020 x^{\frac{1}{5}} + 12005 x^{\frac{1}{5}}$ and $0$ .

Subtract $16807$ from $16807$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 490 x^{\frac{3}{5}} + 12005 x^{\frac{1}{5}} - 980 x^{\frac{3}{5}} - 48020 x^{\frac{1}{5}} + 490 x^{\frac{3}{5}} + 72030 x^{\frac{1}{5}} - 48020 x^{\frac{1}{5}} + 12005 x^{\frac{1}{5}} + 0$

Add $x + 490 x^{\frac{3}{5}} + 12005 x^{\frac{1}{5}} - 980 x^{\frac{3}{5}} - 48020 x^{\frac{1}{5}} + 490 x^{\frac{3}{5}} + 72030 x^{\frac{1}{5}} - 48020 x^{\frac{1}{5}} + 12005 x^{\frac{1}{5}}$ and $0$ .

Subtract $980 x^{\frac{3}{5}}$ from $490 x^{\frac{3}{5}}$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 12005 x^{\frac{1}{5}} - 490 x^{\frac{3}{5}} - 48020 x^{\frac{1}{5}} + 490 x^{\frac{3}{5}} + 72030 x^{\frac{1}{5}} - 48020 x^{\frac{1}{5}} + 12005 x^{\frac{1}{5}}$

Combine the opposite terms in $x + 12005 x^{\frac{1}{5}} - 490 x^{\frac{3}{5}} - 48020 x^{\frac{1}{5}} + 490 x^{\frac{3}{5}} + 72030 x^{\frac{1}{5}} - 48020 x^{\frac{1}{5}} + 12005 x^{\frac{1}{5}}$ .

Add $- 490 x^{\frac{3}{5}}$ and $490 x^{\frac{3}{5}}$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 12005 x^{\frac{1}{5}} - 48020 x^{\frac{1}{5}} + 0 + 72030 x^{\frac{1}{5}} - 48020 x^{\frac{1}{5}} + 12005 x^{\frac{1}{5}}$

Add $x + 12005 x^{\frac{1}{5}} - 48020 x^{\frac{1}{5}}$ and $0$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 12005 x^{\frac{1}{5}} - 48020 x^{\frac{1}{5}} + 72030 x^{\frac{1}{5}} - 48020 x^{\frac{1}{5}} + 12005 x^{\frac{1}{5}}$

Subtract $48020 x^{\frac{1}{5}}$ from $12005 x^{\frac{1}{5}}$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x - 36015 x^{\frac{1}{5}} + 72030 x^{\frac{1}{5}} - 48020 x^{\frac{1}{5}} + 12005 x^{\frac{1}{5}}$

Add $- 36015 x^{\frac{1}{5}}$ and $72030 x^{\frac{1}{5}}$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 36015 x^{\frac{1}{5}} - 48020 x^{\frac{1}{5}} + 12005 x^{\frac{1}{5}}$

Subtract $48020 x^{\frac{1}{5}}$ from $36015 x^{\frac{1}{5}}$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x - 12005 x^{\frac{1}{5}} + 12005 x^{\frac{1}{5}}$

Combine the opposite terms in $x - 12005 x^{\frac{1}{5}} + 12005 x^{\frac{1}{5}}$ .

Add $- 12005 x^{\frac{1}{5}}$ and $12005 x^{\frac{1}{5}}$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x + 0$

Add $x$ and $0$ .

$f^{- 1} (x^{\frac{1}{5}} + 7) = x$

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

Set up the composite result function.

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

Evaluate $f (x^{5} - 35 x^{4} + 490 x^{3} - 3430 x^{2} + 12005 x - 16807)$ by substituting in the value of $f^{- 1}$ into $f$ .

$f (x^{5} - 35 x^{4} + 490 x^{3} - 3430 x^{2} + 12005 x - 16807) = {(x^{5} - 35 x^{4} + 490 x^{3} - 3430 x^{2} + 12005 x - 16807)}^{\frac{1}{5}} + 7$

Since $f^{- 1} (f (x)) = x$ and $f (f^{- 1} (x)) = x$ , then $f^{- 1} (x) = x^{5} - 35 x^{4} + 490 x^{3} - 3430 x^{2} + 12005 x - 16807$ is the inverse of $f (x) = x^{\frac{1}{5}} + 7$ .

$f^{- 1} (x) = x^{5} - 35 x^{4} + 490 x^{3} - 3430 x^{2} + 12005 x - 16807$

Find the Inverse x^(1/5)+7

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