Find the Inverse f(x)=((x^5)/7)^(1/7)-1

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

Write $f (x) = {(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1$ as an equation.

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

Interchange the variables.

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

Solve for $y$ .

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

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

Add $1$ to both sides of the equation.

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

Raise each side of the equation to the power of $7$ to eliminate the fractional exponent on the left side.

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

Simplify the exponent.

Simplify the left side.

Simplify ${({(\frac{y^{5}}{7})}^{\frac{1}{7}})}^{7}$ .

Multiply the exponents in ${({(\frac{y^{5}}{7})}^{\frac{1}{7}})}^{7}$ .

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

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

Cancel the common factor of $7$ .

Cancel the common factor.

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

Rewrite the expression.

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

Simplify.

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

Simplify the right side.

Simplify ${(x + 1)}^{7}$ .

Use the Binomial Theorem.

$\frac{y^{5}}{7} = x^{7} + 7 x^{6} \cdot 1 + 21 x^{5} \cdot 1^{2} + 35 x^{4} \cdot 1^{3} + 35 x^{3} \cdot 1^{4} + 21 x^{2} \cdot 1^{5} + 7 x \cdot 1^{6} + 1^{7}$

Simplify each term.

Multiply $7$ by $1$ .

$\frac{y^{5}}{7} = x^{7} + 7 x^{6} + 21 x^{5} \cdot 1^{2} + 35 x^{4} \cdot 1^{3} + 35 x^{3} \cdot 1^{4} + 21 x^{2} \cdot 1^{5} + 7 x \cdot 1^{6} + 1^{7}$

One to any power is one.

$\frac{y^{5}}{7} = x^{7} + 7 x^{6} + 21 x^{5} \cdot 1 + 35 x^{4} \cdot 1^{3} + 35 x^{3} \cdot 1^{4} + 21 x^{2} \cdot 1^{5} + 7 x \cdot 1^{6} + 1^{7}$

Multiply $21$ by $1$ .

$\frac{y^{5}}{7} = x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} \cdot 1^{3} + 35 x^{3} \cdot 1^{4} + 21 x^{2} \cdot 1^{5} + 7 x \cdot 1^{6} + 1^{7}$

One to any power is one.

$\frac{y^{5}}{7} = x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} \cdot 1 + 35 x^{3} \cdot 1^{4} + 21 x^{2} \cdot 1^{5} + 7 x \cdot 1^{6} + 1^{7}$

Multiply $35$ by $1$ .

$\frac{y^{5}}{7} = x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3} \cdot 1^{4} + 21 x^{2} \cdot 1^{5} + 7 x \cdot 1^{6} + 1^{7}$

One to any power is one.

$\frac{y^{5}}{7} = x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3} \cdot 1 + 21 x^{2} \cdot 1^{5} + 7 x \cdot 1^{6} + 1^{7}$

Multiply $35$ by $1$ .

$\frac{y^{5}}{7} = x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3} + 21 x^{2} \cdot 1^{5} + 7 x \cdot 1^{6} + 1^{7}$

One to any power is one.

$\frac{y^{5}}{7} = x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3} + 21 x^{2} \cdot 1 + 7 x \cdot 1^{6} + 1^{7}$

Multiply $21$ by $1$ .

$\frac{y^{5}}{7} = x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3} + 21 x^{2} + 7 x \cdot 1^{6} + 1^{7}$

One to any power is one.

$\frac{y^{5}}{7} = x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3} + 21 x^{2} + 7 x \cdot 1 + 1^{7}$

Multiply $7$ by $1$ .

$\frac{y^{5}}{7} = x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3} + 21 x^{2} + 7 x + 1^{7}$

One to any power is one.

$\frac{y^{5}}{7} = x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3} + 21 x^{2} + 7 x + 1$

Solve for $y$ .

Multiply both sides of the equation by $7$ .

$7 \frac{y^{5}}{7} = 7 (x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3} + 21 x^{2} + 7 x + 1)$

Simplify both sides of the equation.

Simplify the left side.

Cancel the common factor of $7$ .

Cancel the common factor.

$7 \frac{y^{5}}{7} = 7 (x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3} + 21 x^{2} + 7 x + 1)$

Rewrite the expression.

$y^{5} = 7 (x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3} + 21 x^{2} + 7 x + 1)$

Simplify the right side.

Simplify $7 (x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3} + 21 x^{2} + 7 x + 1)$ .

Apply the distributive property.

$y^{5} = 7 x^{7} + 7 (7 x^{6}) + 7 (21 x^{5}) + 7 (35 x^{4}) + 7 (35 x^{3}) + 7 (21 x^{2}) + 7 (7 x) + 7 \cdot 1$

Simplify.

Multiply $7$ by $7$ .

$y^{5} = 7 x^{7} + 49 x^{6} + 7 (21 x^{5}) + 7 (35 x^{4}) + 7 (35 x^{3}) + 7 (21 x^{2}) + 7 (7 x) + 7 \cdot 1$

Multiply $21$ by $7$ .

$y^{5} = 7 x^{7} + 49 x^{6} + 147 x^{5} + 7 (35 x^{4}) + 7 (35 x^{3}) + 7 (21 x^{2}) + 7 (7 x) + 7 \cdot 1$

Multiply $35$ by $7$ .

$y^{5} = 7 x^{7} + 49 x^{6} + 147 x^{5} + 245 x^{4} + 7 (35 x^{3}) + 7 (21 x^{2}) + 7 (7 x) + 7 \cdot 1$

Multiply $35$ by $7$ .

$y^{5} = 7 x^{7} + 49 x^{6} + 147 x^{5} + 245 x^{4} + 245 x^{3} + 7 (21 x^{2}) + 7 (7 x) + 7 \cdot 1$

Multiply $21$ by $7$ .

$y^{5} = 7 x^{7} + 49 x^{6} + 147 x^{5} + 245 x^{4} + 245 x^{3} + 147 x^{2} + 7 (7 x) + 7 \cdot 1$

Multiply $7$ by $7$ .

$y^{5} = 7 x^{7} + 49 x^{6} + 147 x^{5} + 245 x^{4} + 245 x^{3} + 147 x^{2} + 49 x + 7 \cdot 1$

Multiply $7$ by $1$ .

$y^{5} = 7 x^{7} + 49 x^{6} + 147 x^{5} + 245 x^{4} + 245 x^{3} + 147 x^{2} + 49 x + 7$

Take the 5th root of both sides of the equation to eliminate the exponent on the left side.

$y = \sqrt[5]{7 x^{7} + 49 x^{6} + 147 x^{5} + 245 x^{4} + 245 x^{3} + 147 x^{2} + 49 x + 7}$

Simplify $\sqrt[5]{7 x^{7} + 49 x^{6} + 147 x^{5} + 245 x^{4} + 245 x^{3} + 147 x^{2} + 49 x + 7}$ .

Factor $7$ out of $7 x^{7} + 49 x^{6} + 147 x^{5} + 245 x^{4} + 245 x^{3} + 147 x^{2} + 49 x + 7$ .

Factor $7$ out of $7 x^{7}$ .

$y = \sqrt[5]{7 (x^{7}) + 49 x^{6} + 147 x^{5} + 245 x^{4} + 245 x^{3} + 147 x^{2} + 49 x + 7}$

Factor $7$ out of $49 x^{6}$ .

$y = \sqrt[5]{7 (x^{7}) + 7 (7 x^{6}) + 147 x^{5} + 245 x^{4} + 245 x^{3} + 147 x^{2} + 49 x + 7}$

Factor $7$ out of $147 x^{5}$ .

$y = \sqrt[5]{7 (x^{7}) + 7 (7 x^{6}) + 7 (21 x^{5}) + 245 x^{4} + 245 x^{3} + 147 x^{2} + 49 x + 7}$

Factor $7$ out of $245 x^{4}$ .

$y = \sqrt[5]{7 (x^{7}) + 7 (7 x^{6}) + 7 (21 x^{5}) + 7 (35 x^{4}) + 245 x^{3} + 147 x^{2} + 49 x + 7}$

Factor $7$ out of $245 x^{3}$ .

$y = \sqrt[5]{7 (x^{7}) + 7 (7 x^{6}) + 7 (21 x^{5}) + 7 (35 x^{4}) + 7 (35 x^{3}) + 147 x^{2} + 49 x + 7}$

Factor $7$ out of $147 x^{2}$ .

$y = \sqrt[5]{7 (x^{7}) + 7 (7 x^{6}) + 7 (21 x^{5}) + 7 (35 x^{4}) + 7 (35 x^{3}) + 7 (21 x^{2}) + 49 x + 7}$

Factor $7$ out of $49 x$ .

$y = \sqrt[5]{7 (x^{7}) + 7 (7 x^{6}) + 7 (21 x^{5}) + 7 (35 x^{4}) + 7 (35 x^{3}) + 7 (21 x^{2}) + 7 (7 x) + 7}$

Factor $7$ out of $7$ .

$y = \sqrt[5]{7 (x^{7}) + 7 (7 x^{6}) + 7 (21 x^{5}) + 7 (35 x^{4}) + 7 (35 x^{3}) + 7 (21 x^{2}) + 7 (7 x) + 7 (1)}$

Factor $7$ out of $7 (x^{7}) + 7 (7 x^{6})$ .

$y = \sqrt[5]{7 (x^{7} + 7 x^{6}) + 7 (21 x^{5}) + 7 (35 x^{4}) + 7 (35 x^{3}) + 7 (21 x^{2}) + 7 (7 x) + 7 (1)}$

Factor $7$ out of $7 (x^{7} + 7 x^{6}) + 7 (21 x^{5})$ .

$y = \sqrt[5]{7 (x^{7} + 7 x^{6} + 21 x^{5}) + 7 (35 x^{4}) + 7 (35 x^{3}) + 7 (21 x^{2}) + 7 (7 x) + 7 (1)}$

Factor $7$ out of $7 (x^{7} + 7 x^{6} + 21 x^{5}) + 7 (35 x^{4})$ .

$y = \sqrt[5]{7 (x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4}) + 7 (35 x^{3}) + 7 (21 x^{2}) + 7 (7 x) + 7 (1)}$

Factor $7$ out of $7 (x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4}) + 7 (35 x^{3})$ .

$y = \sqrt[5]{7 (x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3}) + 7 (21 x^{2}) + 7 (7 x) + 7 (1)}$

Factor $7$ out of $7 (x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3}) + 7 (21 x^{2})$ .

$y = \sqrt[5]{7 (x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3} + 21 x^{2}) + 7 (7 x) + 7 (1)}$

Factor $7$ out of $7 (x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3} + 21 x^{2}) + 7 (7 x)$ .

$y = \sqrt[5]{7 (x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3} + 21 x^{2} + 7 x) + 7 (1)}$

Factor $7$ out of $7 (x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3} + 21 x^{2} + 7 x) + 7 (1)$ .

$y = \sqrt[5]{7 (x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3} + 21 x^{2} + 7 x + 1)}$

Factor $x^{7} + 7 x^{6} + 21 x^{5} + 35 x^{4} + 35 x^{3} + 21 x^{2} + 7 x + 1$ using the binomial theorem.

$y = \sqrt[5]{7 {(x + 1)}^{7}}$

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

Factor out ${(x + 1)}^{5}$ .

$y = \sqrt[5]{7 ({(x + 1)}^{5} {(x + 1)}^{2})}$

Reorder $7$ and ${(x + 1)}^{5}$ .

$y = \sqrt[5]{{(x + 1)}^{5} \cdot 7 {(x + 1)}^{2}}$

Rewrite $1$ as $1^{5}$ .

$y = \sqrt[5]{{(x + 1^{5})}^{5} \cdot 7 {(x + 1)}^{2}}$

Add parentheses.

$y = \sqrt[5]{{(x + 1^{5})}^{5} \cdot (7 {(x + 1)}^{2})}$

Pull terms out from under the radical.

$y = (x + 1^{5}) \sqrt[5]{7 {(x + 1)}^{2}}$

One to any power is one.

$y = (x + 1) \sqrt[5]{7 {(x + 1)}^{2}}$

Simplify $(x + 1) \sqrt[5]{7 {(x + 1)}^{2}}$ .

Apply the distributive property.

$y = x \sqrt[5]{7 {(x + 1)}^{2}} + 1 \sqrt[5]{7 {(x + 1)}^{2}}$

Multiply $\sqrt[5]{7 {(x + 1)}^{2}}$ by $1$ .

$y = x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}$

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

$f^{- 1} (x) = x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}$

Verify if $f^{- 1} (x) = x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}$ is the inverse of $f (x) = {(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1$ .

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

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) \sqrt[5]{7 {(({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) + 1)}^{2}} + \sqrt[5]{7 {(({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) + 1)}^{2}}$

Combine the opposite terms in $({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) \sqrt[5]{7 {(({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) + 1)}^{2}} + \sqrt[5]{7 {(({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) + 1)}^{2}}$ .

Add $- 1$ and $1$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}} + 0)}^{2}} + \sqrt[5]{7 {(({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) + 1)}^{2}}$

Add ${(\frac{x^{5}}{7})}^{\frac{1}{7}}$ and $0$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}} + \sqrt[5]{7 {(({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) + 1)}^{2}}$

Add $- 1$ and $1$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}} + 0)}^{2}}$

Add ${(\frac{x^{5}}{7})}^{\frac{1}{7}}$ and $0$ .

Simplify each term.

Apply the product rule to $\frac{x^{5}}{7}$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = (\frac{{(x^{5})}^{\frac{1}{7}}}{7^{\frac{1}{7}}} - 1) \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Multiply the exponents in ${(x^{5})}^{\frac{1}{7}}$ .

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

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = (\frac{x^{5 (\frac{1}{7})}}{7^{\frac{1}{7}}} - 1) \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Combine $5$ and $\frac{1}{7}$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = (\frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}} - 1) \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Multiply the exponents in ${({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}$ .

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

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = (\frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}} - 1) \sqrt[5]{7 {(\frac{x^{5}}{7})}^{\frac{1}{7} \cdot 2}} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Combine $\frac{1}{7}$ and $2$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = (\frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}} - 1) \sqrt[5]{7 {(\frac{x^{5}}{7})}^{\frac{2}{7}}} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Apply the product rule to $\frac{x^{5}}{7}$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = (\frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}} - 1) \sqrt[5]{7 (\frac{{(x^{5})}^{\frac{2}{7}}}{7^{\frac{2}{7}}})} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Multiply the exponents in ${(x^{5})}^{\frac{2}{7}}$ .

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

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = (\frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}} - 1) \sqrt[5]{7 (\frac{x^{5 (\frac{2}{7})}}{7^{\frac{2}{7}}})} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Multiply $5 (\frac{2}{7})$ .

Combine $5$ and $\frac{2}{7}$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = (\frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}} - 1) \sqrt[5]{7 (\frac{x^{\frac{5 \cdot 2}{7}}}{7^{\frac{2}{7}}})} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Multiply $5$ by $2$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = (\frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}} - 1) \sqrt[5]{7 (\frac{x^{\frac{10}{7}}}{7^{\frac{2}{7}}})} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Combine $7$ and $\frac{x^{\frac{10}{7}}}{7^{\frac{2}{7}}}$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = (\frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}} - 1) \sqrt[5]{\frac{7 x^{\frac{10}{7}}}{7^{\frac{2}{7}}}} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Reduce the expression by cancelling the common factors.

Move $7^{\frac{2}{7}}$ to the numerator using the negative exponent rule $\frac{1}{b^{n}} = b^{- n}$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = (\frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}} - 1) \sqrt[5]{7 x^{\frac{10}{7}} \cdot 7^{- \frac{2}{7}}} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Multiply $7$ by $7^{- \frac{2}{7}}$ by adding the exponents.

Move $7^{- \frac{2}{7}}$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = (\frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}} - 1) \sqrt[5]{7^{- \frac{2}{7}} \cdot (7 x^{\frac{10}{7}})} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Multiply $7^{- \frac{2}{7}}$ by $7$ .

Raise $7$ to the power of $1$ .

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

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = (\frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}} - 1) \sqrt[5]{7^{- \frac{2}{7} + 1} x^{\frac{10}{7}}} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Write $1$ as a fraction with a common denominator.

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = (\frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}} - 1) \sqrt[5]{7^{- \frac{2}{7} + \frac{7}{7}} x^{\frac{10}{7}}} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Combine the numerators over the common denominator.

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = (\frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}} - 1) \sqrt[5]{7^{\frac{- 2 + 7}{7}} x^{\frac{10}{7}}} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Add $- 2$ and $7$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = (\frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}} - 1) \sqrt[5]{7^{\frac{5}{7}} x^{\frac{10}{7}}} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Rewrite $7^{\frac{5}{7}} x^{\frac{10}{7}}$ as ${(7^{\frac{1}{7}} x^{\frac{2}{7}})}^{5}$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = (\frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}} - 1) \sqrt[5]{{(7^{\frac{1}{7}} x^{\frac{2}{7}})}^{5}} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

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

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = (\frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}} - 1) (7^{\frac{1}{7}} x^{\frac{2}{7}}) + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Apply the distributive property.

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = \frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}} \cdot (7^{\frac{1}{7}} x^{\frac{2}{7}}) - 1 (7^{\frac{1}{7}} x^{\frac{2}{7}}) + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Rewrite using the commutative property of multiplication.

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = 7^{\frac{1}{7}} (\frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}}) \cdot x^{\frac{2}{7}} - 1 (7^{\frac{1}{7}} x^{\frac{2}{7}}) + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

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

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = 7^{\frac{1}{7}} (\frac{x^{\frac{5}{7}}}{7^{\frac{1}{7}}}) \cdot x^{\frac{2}{7}} - (7^{\frac{1}{7}} x^{\frac{2}{7}}) + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Simplify each term.

Cancel the common factor of $7^{\frac{1}{7}}$ .

Cancel the common factor.

Rewrite the expression.

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x^{\frac{5}{7}} x^{\frac{2}{7}} - (7^{\frac{1}{7}} x^{\frac{2}{7}}) + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Multiply $x^{\frac{5}{7}}$ by $x^{\frac{2}{7}}$ by adding the exponents.

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

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x^{\frac{5}{7} + \frac{2}{7}} - (7^{\frac{1}{7}} x^{\frac{2}{7}}) + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Combine the numerators over the common denominator.

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x^{\frac{5 + 2}{7}} - (7^{\frac{1}{7}} x^{\frac{2}{7}}) + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Add $5$ and $2$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x^{\frac{7}{7}} - (7^{\frac{1}{7}} x^{\frac{2}{7}}) + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Divide $7$ by $7$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x - (7^{\frac{1}{7}} x^{\frac{2}{7}}) + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Simplify $x^{1}$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x - 7^{\frac{1}{7}} x^{\frac{2}{7}} + \sqrt[5]{7 {({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}}$

Multiply the exponents in ${({(\frac{x^{5}}{7})}^{\frac{1}{7}})}^{2}$ .

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

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x - 7^{\frac{1}{7}} x^{\frac{2}{7}} + \sqrt[5]{7 {(\frac{x^{5}}{7})}^{\frac{1}{7} \cdot 2}}$

Combine $\frac{1}{7}$ and $2$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x - 7^{\frac{1}{7}} x^{\frac{2}{7}} + \sqrt[5]{7 {(\frac{x^{5}}{7})}^{\frac{2}{7}}}$

Apply the product rule to $\frac{x^{5}}{7}$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x - 7^{\frac{1}{7}} x^{\frac{2}{7}} + \sqrt[5]{7 (\frac{{(x^{5})}^{\frac{2}{7}}}{7^{\frac{2}{7}}})}$

Multiply the exponents in ${(x^{5})}^{\frac{2}{7}}$ .

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

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x - 7^{\frac{1}{7}} x^{\frac{2}{7}} + \sqrt[5]{7 (\frac{x^{5 (\frac{2}{7})}}{7^{\frac{2}{7}}})}$

Multiply $5 (\frac{2}{7})$ .

Combine $5$ and $\frac{2}{7}$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x - 7^{\frac{1}{7}} x^{\frac{2}{7}} + \sqrt[5]{7 (\frac{x^{\frac{5 \cdot 2}{7}}}{7^{\frac{2}{7}}})}$

Multiply $5$ by $2$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x - 7^{\frac{1}{7}} x^{\frac{2}{7}} + \sqrt[5]{7 (\frac{x^{\frac{10}{7}}}{7^{\frac{2}{7}}})}$

Combine $7$ and $\frac{x^{\frac{10}{7}}}{7^{\frac{2}{7}}}$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x - 7^{\frac{1}{7}} x^{\frac{2}{7}} + \sqrt[5]{\frac{7 x^{\frac{10}{7}}}{7^{\frac{2}{7}}}}$

Reduce the expression by cancelling the common factors.

Move $7^{\frac{2}{7}}$ to the numerator using the negative exponent rule $\frac{1}{b^{n}} = b^{- n}$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x - 7^{\frac{1}{7}} x^{\frac{2}{7}} + \sqrt[5]{7 x^{\frac{10}{7}} \cdot 7^{- \frac{2}{7}}}$

Multiply $7$ by $7^{- \frac{2}{7}}$ by adding the exponents.

Move $7^{- \frac{2}{7}}$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x - 7^{\frac{1}{7}} x^{\frac{2}{7}} + \sqrt[5]{7^{- \frac{2}{7}} \cdot (7 x^{\frac{10}{7}})}$

Multiply $7^{- \frac{2}{7}}$ by $7$ .

Raise $7$ to the power of $1$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x - 7^{\frac{1}{7}} x^{\frac{2}{7}} + \sqrt[5]{7^{- \frac{2}{7}} \cdot (7 x^{\frac{10}{7}})}$

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

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x - 7^{\frac{1}{7}} x^{\frac{2}{7}} + \sqrt[5]{7^{- \frac{2}{7} + 1} x^{\frac{10}{7}}}$

Write $1$ as a fraction with a common denominator.

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x - 7^{\frac{1}{7}} x^{\frac{2}{7}} + \sqrt[5]{7^{- \frac{2}{7} + \frac{7}{7}} x^{\frac{10}{7}}}$

Combine the numerators over the common denominator.

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x - 7^{\frac{1}{7}} x^{\frac{2}{7}} + \sqrt[5]{7^{\frac{- 2 + 7}{7}} x^{\frac{10}{7}}}$

Add $- 2$ and $7$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x - 7^{\frac{1}{7}} x^{\frac{2}{7}} + \sqrt[5]{7^{\frac{5}{7}} x^{\frac{10}{7}}}$

Rewrite $7^{\frac{5}{7}} x^{\frac{10}{7}}$ as ${(7^{\frac{1}{7}} x^{\frac{2}{7}})}^{5}$ .

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x - 7^{\frac{1}{7}} x^{\frac{2}{7}} + \sqrt[5]{{(7^{\frac{1}{7}} x^{\frac{2}{7}})}^{5}}$

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

$f^{- 1} ({(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1) = x - 7^{\frac{1}{7}} x^{\frac{2}{7}} + 7^{\frac{1}{7}} x^{\frac{2}{7}}$

Combine the opposite terms in $x - 7^{\frac{1}{7}} x^{\frac{2}{7}} + 7^{\frac{1}{7}} x^{\frac{2}{7}}$ .

Add $- 7^{\frac{1}{7}} x^{\frac{2}{7}}$ and $7^{\frac{1}{7}} x^{\frac{2}{7}}$ .

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

Add $x$ and $0$ .

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

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

Set up the composite result function.

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

Evaluate $f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}})$ by substituting in the value of $f^{- 1}$ into $f$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{{(x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}})}^{5}}{7})}^{\frac{1}{7}} - 1$

Simplify each term.

Simplify the numerator.

Factor $\sqrt[5]{7 {(x + 1)}^{2}}$ out of $x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}$ .

Factor $\sqrt[5]{7 {(x + 1)}^{2}}$ out of $x \sqrt[5]{7 {(x + 1)}^{2}}$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{{(\sqrt[5]{7 {(x + 1)}^{2}} x + \sqrt[5]{7 {(x + 1)}^{2}})}^{5}}{7})}^{\frac{1}{7}} - 1$

Multiply by $1$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{{(\sqrt[5]{7 {(x + 1)}^{2}} x + \sqrt[5]{7 {(x + 1)}^{2}} \cdot 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Factor $\sqrt[5]{7 {(x + 1)}^{2}}$ out of $\sqrt[5]{7 {(x + 1)}^{2}} x + \sqrt[5]{7 {(x + 1)}^{2}} \cdot 1$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{{(\sqrt[5]{7 {(x + 1)}^{2}} (x + 1))}^{5}}{7})}^{\frac{1}{7}} - 1$

Apply the product rule to $\sqrt[5]{7 {(x + 1)}^{2}} (x + 1)$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{{\sqrt[5]{7 {(x + 1)}^{2}}}^{5} {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

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

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[5]{7 {(x + 1)}^{2}}$ as ${(7 {(x + 1)}^{2})}^{\frac{1}{5}}$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{{({(7 {(x + 1)}^{2})}^{\frac{1}{5}})}^{5} {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

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

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{{(7 {(x + 1)}^{2})}^{\frac{1}{5} \cdot 5} {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

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

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{{(7 {(x + 1)}^{2})}^{\frac{5}{5}} {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Cancel the common factor of $5$ .

Cancel the common factor.

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{{(7 {(x + 1)}^{2})}^{\frac{5}{5}} {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Rewrite the expression.

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{(7 {(x + 1)}^{2}) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Simplify.

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{7 {(x + 1)}^{2} {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Rewrite ${(x + 1)}^{2}$ as $(x + 1) (x + 1)$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{7 ((x + 1) (x + 1)) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Expand $(x + 1) (x + 1)$ using the FOIL Method.

Apply the distributive property.

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{7 (x (x + 1) + 1 (x + 1)) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Apply the distributive property.

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{7 (x \cdot x + x \cdot 1 + 1 (x + 1)) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Apply the distributive property.

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{7 (x \cdot x + x \cdot 1 + 1 x + 1 \cdot 1) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Simplify and combine like terms.

Simplify each term.

Multiply $x$ by $x$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{7 (x^{2} + x \cdot 1 + 1 x + 1 \cdot 1) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Multiply $x$ by $1$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{7 (x^{2} + x + 1 x + 1 \cdot 1) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Multiply $x$ by $1$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{7 (x^{2} + x + x + 1 \cdot 1) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Multiply $1$ by $1$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{7 (x^{2} + x + x + 1) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Add $x$ and $x$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{7 (x^{2} + 2 x + 1) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Apply the distributive property.

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{(7 x^{2} + 7 (2 x) + 7 \cdot 1) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Simplify.

Multiply $2$ by $7$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{(7 x^{2} + 14 x + 7 \cdot 1) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Multiply $7$ by $1$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{(7 x^{2} + 14 x + 7) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Factor $7$ out of $7 x^{2} + 14 x + 7$ .

Factor $7$ out of $7 x^{2}$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{(7 (x^{2}) + 14 x + 7) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Factor $7$ out of $14 x$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{(7 (x^{2}) + 7 (2 x) + 7) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Factor $7$ out of $7$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{(7 (x^{2}) + 7 (2 x) + 7 (1)) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Factor $7$ out of $7 (x^{2}) + 7 (2 x)$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{(7 (x^{2} + 2 x) + 7 (1)) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Factor $7$ out of $7 (x^{2} + 2 x) + 7 (1)$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{7 (x^{2} + 2 x + 1) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Factor using the perfect square rule.

Rewrite $1$ as $1^{2}$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{7 (x^{2} + 2 x + 1^{2}) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Check that the middle term is two times the product of the numbers being squared in the first term and third term.

$2 x = 2 \cdot x \cdot 1$

Rewrite the polynomial.

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{7 (x^{2} + 2 \cdot x \cdot 1 + 1^{2}) {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Factor using the perfect square trinomial rule $a^{2} + 2 a b + b^{2} = {(a + b)}^{2}$ , where $a = x$ and $b = 1$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{7 {(x + 1)}^{2} {(x + 1)}^{5}}{7})}^{\frac{1}{7}} - 1$

Multiply ${(x + 1)}^{2}$ by ${(x + 1)}^{5}$ by adding the exponents.

Move ${(x + 1)}^{5}$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{7 ({(x + 1)}^{5} {(x + 1)}^{2})}{7})}^{\frac{1}{7}} - 1$

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

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{7 {(x + 1)}^{5 + 2}}{7})}^{\frac{1}{7}} - 1$

Add $5$ and $2$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{7 {(x + 1)}^{7}}{7})}^{\frac{1}{7}} - 1$

Cancel the common factor of $7$ .

Cancel the common factor.

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(\frac{7 {(x + 1)}^{7}}{7})}^{\frac{1}{7}} - 1$

Divide ${(x + 1)}^{7}$ by $1$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {({(x + 1)}^{7})}^{\frac{1}{7}} - 1$

Multiply the exponents in ${({(x + 1)}^{7})}^{\frac{1}{7}}$ .

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

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(x + 1)}^{7 (\frac{1}{7})} - 1$

Cancel the common factor of $7$ .

Cancel the common factor.

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = {(x + 1)}^{7 (\frac{1}{7})} - 1$

Rewrite the expression.

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = (x + 1) - 1$

Simplify.

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = x + 1 - 1$

Combine the opposite terms in $x + 1 - 1$ .

Subtract $1$ from $1$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = x + 0$

Add $x$ and $0$ .

$f (x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}) = x$

Since $f^{- 1} (f (x)) = x$ and $f (f^{- 1} (x)) = x$ , then $f^{- 1} (x) = x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}$ is the inverse of $f (x) = {(\frac{x^{5}}{7})}^{\frac{1}{7}} - 1$ .

$f^{- 1} (x) = x \sqrt[5]{7 {(x + 1)}^{2}} + \sqrt[5]{7 {(x + 1)}^{2}}$

Find the Inverse f(x)=((x^5)/7)^(1/7)-1

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