Trigonometry Examples

$f (x) = \sqrt[3]{\frac{x}{7}} - 9$

Step 1

Write $f (x) = \sqrt[3]{\frac{x}{7}} - 9$ as an equation.

$y = \sqrt[3]{\frac{x}{7}} - 9$

Step 2

Interchange the variables.

$x = \sqrt[3]{\frac{y}{7}} - 9$

Step 3

Solve for $y$ .

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Step 3.1

Rewrite the equation as $\sqrt[3]{\frac{y}{7}} - 9 = x$ .

$\sqrt[3]{\frac{y}{7}} - 9 = x$

Step 3.2

Add $9$ to both sides of the equation.

$\sqrt[3]{\frac{y}{7}} = x + 9$

Step 3.3

To remove the radical on the left side of the equation, cube both sides of the equation.

${\sqrt[3]{\frac{y}{7}}}^{3} = {(x + 9)}^{3}$

Step 3.4

Simplify each side of the equation.

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Step 3.4.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[3]{\frac{y}{7}}$ as ${(\frac{y}{7})}^{\frac{1}{3}}$ .

${({(\frac{y}{7})}^{\frac{1}{3}})}^{3} = {(x + 9)}^{3}$

Step 3.4.2

Simplify the left side.

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Step 3.4.2.1

Simplify ${({(\frac{y}{7})}^{\frac{1}{3}})}^{3}$ .

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Step 3.4.2.1.1

Multiply the exponents in ${({(\frac{y}{7})}^{\frac{1}{3}})}^{3}$ .

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Step 3.4.2.1.1.1

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

${(\frac{y}{7})}^{\frac{1}{3} \cdot 3} = {(x + 9)}^{3}$

Step 3.4.2.1.1.2

Cancel the common factor of $3$ .

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Step 3.4.2.1.1.2.1

Cancel the common factor.

${(\frac{y}{7})}^{\frac{1}{3} \cdot 3} = {(x + 9)}^{3}$

Step 3.4.2.1.1.2.2

Rewrite the expression.

${(\frac{y}{7})}^{1} = {(x + 9)}^{3}$

Step 3.4.2.1.2

Simplify.

$\frac{y}{7} = {(x + 9)}^{3}$

Step 3.4.3

Simplify the right side.

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Step 3.4.3.1

Simplify ${(x + 9)}^{3}$ .

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Step 3.4.3.1.1

Use the Binomial Theorem.

$\frac{y}{7} = x^{3} + 3 x^{2} \cdot 9 + 3 x \cdot 9^{2} + 9^{3}$

Step 3.4.3.1.2

Simplify each term.

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Step 3.4.3.1.2.1

Multiply $9$ by $3$ .

$\frac{y}{7} = x^{3} + 27 x^{2} + 3 x \cdot 9^{2} + 9^{3}$

Step 3.4.3.1.2.2

Raise $9$ to the power of $2$ .

$\frac{y}{7} = x^{3} + 27 x^{2} + 3 x \cdot 81 + 9^{3}$

Step 3.4.3.1.2.3

Multiply $81$ by $3$ .

$\frac{y}{7} = x^{3} + 27 x^{2} + 243 x + 9^{3}$

Step 3.4.3.1.2.4

Raise $9$ to the power of $3$ .

$\frac{y}{7} = x^{3} + 27 x^{2} + 243 x + 729$

Step 3.5

Solve for $y$ .

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Step 3.5.1

Multiply both sides of the equation by $7$ .

$7 \frac{y}{7} = 7 (x^{3} + 27 x^{2} + 243 x + 729)$

Step 3.5.2

Simplify both sides of the equation.

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Step 3.5.2.1

Simplify the left side.

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Step 3.5.2.1.1

Cancel the common factor of $7$ .

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Step 3.5.2.1.1.1

Cancel the common factor.

$7 \frac{y}{7} = 7 (x^{3} + 27 x^{2} + 243 x + 729)$

Step 3.5.2.1.1.2

Rewrite the expression.

$y = 7 (x^{3} + 27 x^{2} + 243 x + 729)$

Step 3.5.2.2

Simplify the right side.

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Step 3.5.2.2.1

Simplify $7 (x^{3} + 27 x^{2} + 243 x + 729)$ .

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Step 3.5.2.2.1.1

Apply the distributive property.

$y = 7 x^{3} + 7 (27 x^{2}) + 7 (243 x) + 7 \cdot 729$

Step 3.5.2.2.1.2

Simplify.

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Step 3.5.2.2.1.2.1

Multiply $27$ by $7$ .

$y = 7 x^{3} + 189 x^{2} + 7 (243 x) + 7 \cdot 729$

Step 3.5.2.2.1.2.2

Multiply $243$ by $7$ .

$y = 7 x^{3} + 189 x^{2} + 1701 x + 7 \cdot 729$

Step 3.5.2.2.1.2.3

Multiply $7$ by $729$ .

$y = 7 x^{3} + 189 x^{2} + 1701 x + 5103$

Step 4

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

$f^{- 1} (x) = 7 x^{3} + 189 x^{2} + 1701 x + 5103$

Step 5

Verify if $f^{- 1} (x) = 7 x^{3} + 189 x^{2} + 1701 x + 5103$ is the inverse of $f (x) = \sqrt[3]{\frac{x}{7}} - 9$ .

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Step 5.1

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

Step 5.2

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

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Step 5.2.1

Set up the composite result function.

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

Step 5.2.2

Evaluate $f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9)$ by substituting in the value of $f$ into $f^{- 1}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 {(\sqrt[3]{\frac{x}{7}} - 9)}^{3} + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3

Simplify each term.

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Step 5.2.3.1

Simplify each term.

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Step 5.2.3.1.1

Rewrite $\sqrt[3]{\frac{x}{7}}$ as $\frac{\sqrt[3]{x}}{\sqrt[3]{7}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 {(\frac{\sqrt[3]{x}}{\sqrt[3]{7}} - 9)}^{3} + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.1.2

Multiply $\frac{\sqrt[3]{x}}{\sqrt[3]{7}}$ by $\frac{{\sqrt[3]{7}}^{2}}{{\sqrt[3]{7}}^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 {(\frac{\sqrt[3]{x}}{\sqrt[3]{7}} \cdot \frac{{\sqrt[3]{7}}^{2}}{{\sqrt[3]{7}}^{2}} - 9)}^{3} + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.1.3

Combine and simplify the denominator.

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Step 5.2.3.1.3.1

Multiply $\frac{\sqrt[3]{x}}{\sqrt[3]{7}}$ by $\frac{{\sqrt[3]{7}}^{2}}{{\sqrt[3]{7}}^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 {(\frac{\sqrt[3]{x} {\sqrt[3]{7}}^{2}}{\sqrt[3]{7} {\sqrt[3]{7}}^{2}} - 9)}^{3} + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.1.3.2

Raise $\sqrt[3]{7}$ to the power of $1$ .

Step 5.2.3.1.3.3

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

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 {(\frac{\sqrt[3]{x} {\sqrt[3]{7}}^{2}}{{\sqrt[3]{7}}^{1 + 2}} - 9)}^{3} + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.1.3.4

Add $1$ and $2$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 {(\frac{\sqrt[3]{x} {\sqrt[3]{7}}^{2}}{{\sqrt[3]{7}}^{3}} - 9)}^{3} + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.1.3.5

Rewrite ${\sqrt[3]{7}}^{3}$ as $7$ .

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Step 5.2.3.1.3.5.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[3]{7}$ as $7^{\frac{1}{3}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 {(\frac{\sqrt[3]{x} {\sqrt[3]{7}}^{2}}{{(7^{\frac{1}{3}})}^{3}} - 9)}^{3} + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.1.3.5.2

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

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 {(\frac{\sqrt[3]{x} {\sqrt[3]{7}}^{2}}{7^{\frac{1}{3} \cdot 3}} - 9)}^{3} + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.1.3.5.3

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

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 {(\frac{\sqrt[3]{x} {\sqrt[3]{7}}^{2}}{7^{\frac{3}{3}}} - 9)}^{3} + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.1.3.5.4

Cancel the common factor of $3$ .

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Step 5.2.3.1.3.5.4.1

Cancel the common factor.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 {(\frac{\sqrt[3]{x} {\sqrt[3]{7}}^{2}}{7^{\frac{3}{3}}} - 9)}^{3} + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.1.3.5.4.2

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 {(\frac{\sqrt[3]{x} {\sqrt[3]{7}}^{2}}{7} - 9)}^{3} + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.1.3.5.5

Evaluate the exponent.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 {(\frac{\sqrt[3]{x} {\sqrt[3]{7}}^{2}}{7} - 9)}^{3} + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.1.4

Simplify the numerator.

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Step 5.2.3.1.4.1

Rewrite ${\sqrt[3]{7}}^{2}$ as $\sqrt[3]{7^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 {(\frac{\sqrt[3]{x} \sqrt[3]{7^{2}}}{7} - 9)}^{3} + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.1.4.2

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

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 {(\frac{\sqrt[3]{x} \sqrt[3]{49}}{7} - 9)}^{3} + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.1.5

Combine using the product rule for radicals.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 {(\frac{\sqrt[3]{x \cdot 49}}{7} - 9)}^{3} + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.2

Use the Binomial Theorem.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 ({(\frac{\sqrt[3]{x \cdot 49}}{7})}^{3} + 3 {(\frac{\sqrt[3]{x \cdot 49}}{7})}^{2} \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3

Simplify each term.

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Step 5.2.3.3.1

Apply the product rule to $\frac{\sqrt[3]{x \cdot 49}}{7}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{{\sqrt[3]{x \cdot 49}}^{3}}{7^{3}} + 3 {(\frac{\sqrt[3]{x \cdot 49}}{7})}^{2} \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.2

Simplify the numerator.

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Step 5.2.3.3.2.1

Rewrite ${\sqrt[3]{x \cdot 49}}^{3}$ as $x \cdot 49$ .

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Step 5.2.3.3.2.1.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[3]{x \cdot 49}$ as ${(x \cdot 49)}^{\frac{1}{3}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{{({(x \cdot 49)}^{\frac{1}{3}})}^{3}}{7^{3}} + 3 {(\frac{\sqrt[3]{x \cdot 49}}{7})}^{2} \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.2.1.2

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

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{{(x \cdot 49)}^{\frac{1}{3} \cdot 3}}{7^{3}} + 3 {(\frac{\sqrt[3]{x \cdot 49}}{7})}^{2} \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.2.1.3

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

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{{(x \cdot 49)}^{\frac{3}{3}}}{7^{3}} + 3 {(\frac{\sqrt[3]{x \cdot 49}}{7})}^{2} \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.2.1.4

Cancel the common factor of $3$ .

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Step 5.2.3.3.2.1.4.1

Cancel the common factor.

Step 5.2.3.3.2.1.4.2

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x \cdot 49}{7^{3}} + 3 {(\frac{\sqrt[3]{x \cdot 49}}{7})}^{2} \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.2.1.5

Simplify.

Step 5.2.3.3.2.2

Move $49$ to the left of $x$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{49 x}{7^{3}} + 3 {(\frac{\sqrt[3]{x \cdot 49}}{7})}^{2} \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.3

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

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{49 x}{343} + 3 {(\frac{\sqrt[3]{x \cdot 49}}{7})}^{2} \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.4

Cancel the common factor of $49$ and $343$ .

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Step 5.2.3.3.4.1

Factor $49$ out of $49 x$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{49 (x)}{343} + 3 {(\frac{\sqrt[3]{x \cdot 49}}{7})}^{2} \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.4.2

Cancel the common factors.

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Step 5.2.3.3.4.2.1

Factor $49$ out of $343$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{49 x}{49 \cdot 7} + 3 {(\frac{\sqrt[3]{x \cdot 49}}{7})}^{2} \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.4.2.2

Cancel the common factor.

Step 5.2.3.3.4.2.3

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} + 3 {(\frac{\sqrt[3]{x \cdot 49}}{7})}^{2} \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.5

Apply the product rule to $\frac{\sqrt[3]{x \cdot 49}}{7}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} + 3 (\frac{{\sqrt[3]{x \cdot 49}}^{2}}{7^{2}}) \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.6

Simplify the numerator.

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Step 5.2.3.3.6.1

Rewrite ${\sqrt[3]{x \cdot 49}}^{2}$ as $\sqrt[3]{{(x \cdot 49)}^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} + 3 (\frac{\sqrt[3]{{(x \cdot 49)}^{2}}}{7^{2}}) \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.6.2

Apply the product rule to $x \cdot 49$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} + 3 (\frac{\sqrt[3]{x^{2} \cdot 49^{2}}}{7^{2}}) \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.6.3

Raise $49$ to the power of $2$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} + 3 (\frac{\sqrt[3]{x^{2} \cdot 2401}}{7^{2}}) \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.6.4

Rewrite $x^{2} \cdot 2401$ as $7^{3} \cdot (x^{2} \cdot 7)$ .

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Step 5.2.3.3.6.4.1

Factor $343$ out of $2401$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} + 3 (\frac{\sqrt[3]{x^{2} \cdot (343 (7))}}{7^{2}}) \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.6.4.2

Rewrite $343$ as $7^{3}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} + 3 (\frac{\sqrt[3]{x^{2} \cdot (7^{3} \cdot 7)}}{7^{2}}) \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.6.4.3

Reorder $x^{2}$ and $7^{3}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} + 3 (\frac{\sqrt[3]{7^{3} \cdot x^{2} \cdot 7}}{7^{2}}) \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.6.4.4

Add parentheses.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} + 3 (\frac{\sqrt[3]{7^{3} \cdot (x^{2} \cdot 7)}}{7^{2}}) \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.6.5

Pull terms out from under the radical.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} + 3 (\frac{7 \sqrt[3]{x^{2} \cdot 7}}{7^{2}}) \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.7

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

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} + 3 (\frac{7 \sqrt[3]{x^{2} \cdot 7}}{49}) \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.8

Cancel the common factor of $7$ and $49$ .

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Step 5.2.3.3.8.1

Factor $7$ out of $7 \sqrt[3]{x^{2} \cdot 7}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} + 3 (\frac{7 (\sqrt[3]{x^{2} \cdot 7})}{49}) \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.8.2

Cancel the common factors.

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Step 5.2.3.3.8.2.1

Factor $7$ out of $49$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} + 3 (\frac{7 \sqrt[3]{x^{2} \cdot 7}}{7 \cdot 7}) \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.8.2.2

Cancel the common factor.

Step 5.2.3.3.8.2.3

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} + 3 (\frac{\sqrt[3]{x^{2} \cdot 7}}{7}) \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.9

Combine $3$ and $\frac{\sqrt[3]{x^{2} \cdot 7}}{7}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} + \frac{3 \sqrt[3]{x^{2} \cdot 7}}{7} \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.10

Move $7$ to the left of $x^{2}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} + \frac{3 \sqrt[3]{7 \cdot x^{2}}}{7} \cdot - 9 + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.11

Multiply $\frac{3 \sqrt[3]{7 x^{2}}}{7} \cdot - 9$ .

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Step 5.2.3.3.11.1

Combine $\frac{3 \sqrt[3]{7 x^{2}}}{7}$ and $- 9$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} + \frac{3 \sqrt[3]{7 x^{2}} \cdot - 9}{7} + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.11.2

Multiply $- 9$ by $3$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} + \frac{- 27 \sqrt[3]{7 x^{2}}}{7} + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.12

Move the negative in front of the fraction.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} - \frac{27 \sqrt[3]{7 x^{2}}}{7} + 3 (\frac{\sqrt[3]{x \cdot 49}}{7}) \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.13

Combine $3$ and $\frac{\sqrt[3]{x \cdot 49}}{7}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} - \frac{27 \sqrt[3]{7 x^{2}}}{7} + \frac{3 \sqrt[3]{x \cdot 49}}{7} \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.14

Move $49$ to the left of $x$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} - \frac{27 \sqrt[3]{7 x^{2}}}{7} + \frac{3 \sqrt[3]{49 \cdot x}}{7} \cdot {(- 9)}^{2} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.15

Raise $- 9$ to the power of $2$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} - \frac{27 \sqrt[3]{7 x^{2}}}{7} + \frac{3 \sqrt[3]{49 x}}{7} \cdot 81 + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.16

Multiply $\frac{3 \sqrt[3]{49 x}}{7} \cdot 81$ .

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Step 5.2.3.3.16.1

Combine $\frac{3 \sqrt[3]{49 x}}{7}$ and $81$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} - \frac{27 \sqrt[3]{7 x^{2}}}{7} + \frac{3 \sqrt[3]{49 x} \cdot 81}{7} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.16.2

Multiply $81$ by $3$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} - \frac{27 \sqrt[3]{7 x^{2}}}{7} + \frac{243 \sqrt[3]{49 x}}{7} + {(- 9)}^{3}) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.3.17

Raise $- 9$ to the power of $3$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7} - \frac{27 \sqrt[3]{7 x^{2}}}{7} + \frac{243 \sqrt[3]{49 x}}{7} - 729) + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.4

Apply the distributive property.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = 7 (\frac{x}{7}) + 7 (- \frac{27 \sqrt[3]{7 x^{2}}}{7}) + 7 (\frac{243 \sqrt[3]{49 x}}{7}) + 7 \cdot - 729 + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.5

Simplify.

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Step 5.2.3.5.1

Cancel the common factor of $7$ .

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Step 5.2.3.5.1.1

Cancel the common factor.

Step 5.2.3.5.1.2

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x + 7 (- \frac{27 \sqrt[3]{7 x^{2}}}{7}) + 7 (\frac{243 \sqrt[3]{49 x}}{7}) + 7 \cdot - 729 + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.5.2

Cancel the common factor of $7$ .

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Step 5.2.3.5.2.1

Move the leading negative in $- \frac{27 \sqrt[3]{7 x^{2}}}{7}$ into the numerator.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x + 7 (\frac{- 27 \sqrt[3]{7 x^{2}}}{7}) + 7 (\frac{243 \sqrt[3]{49 x}}{7}) + 7 \cdot - 729 + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.5.2.2

Cancel the common factor.

Step 5.2.3.5.2.3

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 7 (\frac{243 \sqrt[3]{49 x}}{7}) + 7 \cdot - 729 + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.5.3

Cancel the common factor of $7$ .

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Step 5.2.3.5.3.1

Cancel the common factor.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 7 (\frac{243 \sqrt[3]{49 x}}{7}) + 7 \cdot - 729 + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.5.3.2

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} + 7 \cdot - 729 + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.5.4

Multiply $7$ by $- 729$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 {(\sqrt[3]{\frac{x}{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.6

Simplify each term.

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Step 5.2.3.6.1

Rewrite $\sqrt[3]{\frac{x}{7}}$ as $\frac{\sqrt[3]{x}}{\sqrt[3]{7}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 {(\frac{\sqrt[3]{x}}{\sqrt[3]{7}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.6.2

Multiply $\frac{\sqrt[3]{x}}{\sqrt[3]{7}}$ by $\frac{{\sqrt[3]{7}}^{2}}{{\sqrt[3]{7}}^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 {(\frac{\sqrt[3]{x}}{\sqrt[3]{7}} \cdot \frac{{\sqrt[3]{7}}^{2}}{{\sqrt[3]{7}}^{2}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.6.3

Combine and simplify the denominator.

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Step 5.2.3.6.3.1

Multiply $\frac{\sqrt[3]{x}}{\sqrt[3]{7}}$ by $\frac{{\sqrt[3]{7}}^{2}}{{\sqrt[3]{7}}^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 {(\frac{\sqrt[3]{x} {\sqrt[3]{7}}^{2}}{\sqrt[3]{7} {\sqrt[3]{7}}^{2}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.6.3.2

Raise $\sqrt[3]{7}$ to the power of $1$ .

Step 5.2.3.6.3.3

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

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 {(\frac{\sqrt[3]{x} {\sqrt[3]{7}}^{2}}{{\sqrt[3]{7}}^{1 + 2}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.6.3.4

Add $1$ and $2$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 {(\frac{\sqrt[3]{x} {\sqrt[3]{7}}^{2}}{{\sqrt[3]{7}}^{3}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.6.3.5

Rewrite ${\sqrt[3]{7}}^{3}$ as $7$ .

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Step 5.2.3.6.3.5.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[3]{7}$ as $7^{\frac{1}{3}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 {(\frac{\sqrt[3]{x} {\sqrt[3]{7}}^{2}}{{(7^{\frac{1}{3}})}^{3}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.6.3.5.2

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

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 {(\frac{\sqrt[3]{x} {\sqrt[3]{7}}^{2}}{7^{\frac{1}{3} \cdot 3}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.6.3.5.3

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

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 {(\frac{\sqrt[3]{x} {\sqrt[3]{7}}^{2}}{7^{\frac{3}{3}}} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.6.3.5.4

Cancel the common factor of $3$ .

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Step 5.2.3.6.3.5.4.1

Cancel the common factor.

Step 5.2.3.6.3.5.4.2

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 {(\frac{\sqrt[3]{x} {\sqrt[3]{7}}^{2}}{7} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.6.3.5.5

Evaluate the exponent.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 {(\frac{\sqrt[3]{x} {\sqrt[3]{7}}^{2}}{7} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.6.4

Simplify the numerator.

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Step 5.2.3.6.4.1

Rewrite ${\sqrt[3]{7}}^{2}$ as $\sqrt[3]{7^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 {(\frac{\sqrt[3]{x} \sqrt[3]{7^{2}}}{7} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.6.4.2

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

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 {(\frac{\sqrt[3]{x} \sqrt[3]{49}}{7} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.6.5

Combine using the product rule for radicals.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 {(\frac{\sqrt[3]{x \cdot 49}}{7} - 9)}^{2} + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.7

Rewrite ${(\frac{\sqrt[3]{x \cdot 49}}{7} - 9)}^{2}$ as $(\frac{\sqrt[3]{x \cdot 49}}{7} - 9) (\frac{\sqrt[3]{x \cdot 49}}{7} - 9)$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 ((\frac{\sqrt[3]{x \cdot 49}}{7} - 9) (\frac{\sqrt[3]{x \cdot 49}}{7} - 9)) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.8

Expand $(\frac{\sqrt[3]{x \cdot 49}}{7} - 9) (\frac{\sqrt[3]{x \cdot 49}}{7} - 9)$ using the FOIL Method.

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Step 5.2.3.8.1

Apply the distributive property.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x \cdot 49}}{7} \cdot (\frac{\sqrt[3]{x \cdot 49}}{7} - 9) - 9 (\frac{\sqrt[3]{x \cdot 49}}{7} - 9)) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.8.2

Apply the distributive property.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x \cdot 49}}{7} \cdot \frac{\sqrt[3]{x \cdot 49}}{7} + \frac{\sqrt[3]{x \cdot 49}}{7} \cdot - 9 - 9 (\frac{\sqrt[3]{x \cdot 49}}{7} - 9)) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.8.3

Apply the distributive property.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x \cdot 49}}{7} \cdot \frac{\sqrt[3]{x \cdot 49}}{7} + \frac{\sqrt[3]{x \cdot 49}}{7} \cdot - 9 - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9

Simplify and combine like terms.

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Step 5.2.3.9.1

Simplify each term.

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Step 5.2.3.9.1.1

Multiply $\frac{\sqrt[3]{x \cdot 49}}{7} \cdot \frac{\sqrt[3]{x \cdot 49}}{7}$ .

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Step 5.2.3.9.1.1.1

Multiply $\frac{\sqrt[3]{x \cdot 49}}{7}$ by $\frac{\sqrt[3]{x \cdot 49}}{7}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x \cdot 49} \sqrt[3]{x \cdot 49}}{7 \cdot 7} + \frac{\sqrt[3]{x \cdot 49}}{7} \cdot - 9 - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.1.2

Raise $\sqrt[3]{x \cdot 49}$ to the power of $1$ .

Step 5.2.3.9.1.1.3

Raise $\sqrt[3]{x \cdot 49}$ to the power of $1$ .

Step 5.2.3.9.1.1.4

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

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{{\sqrt[3]{x \cdot 49}}^{1 + 1}}{7 \cdot 7} + \frac{\sqrt[3]{x \cdot 49}}{7} \cdot - 9 - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.1.5

Add $1$ and $1$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{{\sqrt[3]{x \cdot 49}}^{2}}{7 \cdot 7} + \frac{\sqrt[3]{x \cdot 49}}{7} \cdot - 9 - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.1.6

Multiply $7$ by $7$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{{\sqrt[3]{x \cdot 49}}^{2}}{49} + \frac{\sqrt[3]{x \cdot 49}}{7} \cdot - 9 - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.2

Simplify the numerator.

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Step 5.2.3.9.1.2.1

Rewrite ${\sqrt[3]{x \cdot 49}}^{2}$ as $\sqrt[3]{{(x \cdot 49)}^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{{(x \cdot 49)}^{2}}}{49} + \frac{\sqrt[3]{x \cdot 49}}{7} \cdot - 9 - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.2.2

Apply the product rule to $x \cdot 49$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x^{2} \cdot 49^{2}}}{49} + \frac{\sqrt[3]{x \cdot 49}}{7} \cdot - 9 - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.2.3

Raise $49$ to the power of $2$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x^{2} \cdot 2401}}{49} + \frac{\sqrt[3]{x \cdot 49}}{7} \cdot - 9 - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.2.4

Rewrite $x^{2} \cdot 2401$ as $7^{3} \cdot (x^{2} \cdot 7)$ .

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Step 5.2.3.9.1.2.4.1

Factor $343$ out of $2401$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x^{2} \cdot (343 (7))}}{49} + \frac{\sqrt[3]{x \cdot 49}}{7} \cdot - 9 - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.2.4.2

Rewrite $343$ as $7^{3}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x^{2} \cdot (7^{3} \cdot 7)}}{49} + \frac{\sqrt[3]{x \cdot 49}}{7} \cdot - 9 - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.2.4.3

Reorder $x^{2}$ and $7^{3}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{7^{3} \cdot x^{2} \cdot 7}}{49} + \frac{\sqrt[3]{x \cdot 49}}{7} \cdot - 9 - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.2.4.4

Add parentheses.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{7^{3} \cdot (x^{2} \cdot 7)}}{49} + \frac{\sqrt[3]{x \cdot 49}}{7} \cdot - 9 - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.2.5

Pull terms out from under the radical.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{7 \sqrt[3]{x^{2} \cdot 7}}{49} + \frac{\sqrt[3]{x \cdot 49}}{7} \cdot - 9 - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.3

Cancel the common factor of $7$ and $49$ .

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Step 5.2.3.9.1.3.1

Factor $7$ out of $7 \sqrt[3]{x^{2} \cdot 7}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{7 (\sqrt[3]{x^{2} \cdot 7})}{49} + \frac{\sqrt[3]{x \cdot 49}}{7} \cdot - 9 - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.3.2

Cancel the common factors.

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Step 5.2.3.9.1.3.2.1

Factor $7$ out of $49$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{7 \sqrt[3]{x^{2} \cdot 7}}{7 \cdot 7} + \frac{\sqrt[3]{x \cdot 49}}{7} \cdot - 9 - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.3.2.2

Cancel the common factor.

Step 5.2.3.9.1.3.2.3

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x^{2} \cdot 7}}{7} + \frac{\sqrt[3]{x \cdot 49}}{7} \cdot - 9 - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.4

Combine $\frac{\sqrt[3]{x \cdot 49}}{7}$ and $- 9$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x^{2} \cdot 7}}{7} + \frac{\sqrt[3]{x \cdot 49} \cdot - 9}{7} - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.5

Move $49$ to the left of $x$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x^{2} \cdot 7}}{7} + \frac{\sqrt[3]{49 \cdot x} \cdot - 9}{7} - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.6

Move $- 9$ to the left of $\sqrt[3]{49 \cdot x}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x^{2} \cdot 7}}{7} + \frac{- 9 \cdot \sqrt[3]{49 \cdot x}}{7} - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.7

Move the negative in front of the fraction.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x^{2} \cdot 7}}{7} - \frac{9 \cdot \sqrt[3]{49 \cdot x}}{7} - 9 \frac{\sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.8

Combine $- 9$ and $\frac{\sqrt[3]{x \cdot 49}}{7}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x^{2} \cdot 7}}{7} - \frac{9 \sqrt[3]{49 x}}{7} + \frac{- 9 \sqrt[3]{x \cdot 49}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.9

Move $49$ to the left of $x$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x^{2} \cdot 7}}{7} - \frac{9 \sqrt[3]{49 x}}{7} + \frac{- 9 \sqrt[3]{49 \cdot x}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.10

Move the negative in front of the fraction.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x^{2} \cdot 7}}{7} - \frac{9 \sqrt[3]{49 x}}{7} - \frac{9 \sqrt[3]{49 \cdot x}}{7} - 9 \cdot - 9) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.1.11

Multiply $- 9$ by $- 9$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x^{2} \cdot 7}}{7} - \frac{9 \sqrt[3]{49 x}}{7} - \frac{9 \sqrt[3]{49 x}}{7} + 81) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.9.2

Subtract $\frac{9 \sqrt[3]{49 x}}{7}$ from $- \frac{9 \sqrt[3]{49 x}}{7}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x^{2} \cdot 7}}{7} - 2 \frac{9 \sqrt[3]{49 x}}{7} + 81) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.10

Simplify each term.

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Step 5.2.3.10.1

Multiply $- 2 \frac{9 \sqrt[3]{49 x}}{7}$ .

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Step 5.2.3.10.1.1

Combine $- 2$ and $\frac{9 \sqrt[3]{49 x}}{7}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x^{2} \cdot 7}}{7} + \frac{- 2 (9 \sqrt[3]{49 x})}{7} + 81) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.10.1.2

Multiply $9$ by $- 2$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x^{2} \cdot 7}}{7} + \frac{- 18 \sqrt[3]{49 x}}{7} + 81) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.10.2

Move the negative in front of the fraction.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x^{2} \cdot 7}}{7} - \frac{18 \sqrt[3]{49 x}}{7} + 81) + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.11

Apply the distributive property.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 189 (\frac{\sqrt[3]{x^{2} \cdot 7}}{7}) + 189 (- \frac{18 \sqrt[3]{49 x}}{7}) + 189 \cdot 81 + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.12

Simplify.

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Step 5.2.3.12.1

Cancel the common factor of $7$ .

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Step 5.2.3.12.1.1

Factor $7$ out of $189$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 7 (27) (\frac{\sqrt[3]{x^{2} \cdot 7}}{7}) + 189 (- \frac{18 \sqrt[3]{49 x}}{7}) + 189 \cdot 81 + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.12.1.2

Cancel the common factor.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 7 \cdot (27 (\frac{\sqrt[3]{x^{2} \cdot 7}}{7})) + 189 (- \frac{18 \sqrt[3]{49 x}}{7}) + 189 \cdot 81 + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.12.1.3

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} + 189 (- \frac{18 \sqrt[3]{49 x}}{7}) + 189 \cdot 81 + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.12.2

Cancel the common factor of $7$ .

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Step 5.2.3.12.2.1

Move the leading negative in $- \frac{18 \sqrt[3]{49 x}}{7}$ into the numerator.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} + 189 (\frac{- 18 \sqrt[3]{49 x}}{7}) + 189 \cdot 81 + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.12.2.2

Factor $7$ out of $189$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} + 7 (27) (\frac{- 18 \sqrt[3]{49 x}}{7}) + 189 \cdot 81 + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.12.2.3

Cancel the common factor.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} + 7 \cdot (27 (\frac{- 18 \sqrt[3]{49 x}}{7})) + 189 \cdot 81 + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.12.2.4

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} + 27 (- 18 \sqrt[3]{49 x}) + 189 \cdot 81 + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.12.3

Multiply $- 18$ by $27$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} - 486 \sqrt[3]{49 x} + 189 \cdot 81 + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.12.4

Multiply $189$ by $81$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} - 486 \sqrt[3]{49 x} + 15309 + 1701 (\sqrt[3]{\frac{x}{7}} - 9) + 5103$

Step 5.2.3.13

Simplify each term.

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Step 5.2.3.13.1

Rewrite $\sqrt[3]{\frac{x}{7}}$ as $\frac{\sqrt[3]{x}}{\sqrt[3]{7}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} - 486 \sqrt[3]{49 x} + 15309 + 1701 (\frac{\sqrt[3]{x}}{\sqrt[3]{7}} - 9) + 5103$

Step 5.2.3.13.2

Multiply $\frac{\sqrt[3]{x}}{\sqrt[3]{7}}$ by $\frac{{\sqrt[3]{7}}^{2}}{{\sqrt[3]{7}}^{2}}$ .

Step 5.2.3.13.3

Combine and simplify the denominator.

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Step 5.2.3.13.3.1

Multiply $\frac{\sqrt[3]{x}}{\sqrt[3]{7}}$ by $\frac{{\sqrt[3]{7}}^{2}}{{\sqrt[3]{7}}^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} - 486 \sqrt[3]{49 x} + 15309 + 1701 (\frac{\sqrt[3]{x} {\sqrt[3]{7}}^{2}}{\sqrt[3]{7} {\sqrt[3]{7}}^{2}} - 9) + 5103$

Step 5.2.3.13.3.2

Raise $\sqrt[3]{7}$ to the power of $1$ .

Step 5.2.3.13.3.3

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

Step 5.2.3.13.3.4

Add $1$ and $2$ .

Step 5.2.3.13.3.5

Rewrite ${\sqrt[3]{7}}^{3}$ as $7$ .

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Step 5.2.3.13.3.5.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[3]{7}$ as $7^{\frac{1}{3}}$ .

Step 5.2.3.13.3.5.2

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

Step 5.2.3.13.3.5.3

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

Step 5.2.3.13.3.5.4

Cancel the common factor of $3$ .

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Step 5.2.3.13.3.5.4.1

Cancel the common factor.

Step 5.2.3.13.3.5.4.2

Rewrite the expression.

Step 5.2.3.13.3.5.5

Evaluate the exponent.

Step 5.2.3.13.4

Simplify the numerator.

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Step 5.2.3.13.4.1

Rewrite ${\sqrt[3]{7}}^{2}$ as $\sqrt[3]{7^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} - 486 \sqrt[3]{49 x} + 15309 + 1701 (\frac{\sqrt[3]{x} \sqrt[3]{7^{2}}}{7} - 9) + 5103$

Step 5.2.3.13.4.2

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

Step 5.2.3.13.5

Combine using the product rule for radicals.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} - 486 \sqrt[3]{49 x} + 15309 + 1701 (\frac{\sqrt[3]{x \cdot 49}}{7} - 9) + 5103$

Step 5.2.3.14

Apply the distributive property.

Step 5.2.3.15

Cancel the common factor of $7$ .

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Step 5.2.3.15.1

Factor $7$ out of $1701$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} - 486 \sqrt[3]{49 x} + 15309 + 7 (243) (\frac{\sqrt[3]{x \cdot 49}}{7}) + 1701 \cdot - 9 + 5103$

Step 5.2.3.15.2

Cancel the common factor.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} - 486 \sqrt[3]{49 x} + 15309 + 7 \cdot (243 (\frac{\sqrt[3]{x \cdot 49}}{7})) + 1701 \cdot - 9 + 5103$

Step 5.2.3.15.3

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} - 486 \sqrt[3]{49 x} + 15309 + 243 \sqrt[3]{x \cdot 49} + 1701 \cdot - 9 + 5103$

Step 5.2.3.16

Multiply $1701$ by $- 9$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} - 486 \sqrt[3]{49 x} + 15309 + 243 \sqrt[3]{x \cdot 49} - 15309 + 5103$

Step 5.2.4

Combine the opposite terms in $x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} - 486 \sqrt[3]{49 x} + 15309 + 243 \sqrt[3]{x \cdot 49} - 15309 + 5103$ .

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Step 5.2.4.1

Subtract $15309$ from $15309$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} - 486 \sqrt[3]{49 x} + 0 + 243 \sqrt[3]{x \cdot 49} + 5103$

Step 5.2.4.2

Add $x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} - 486 \sqrt[3]{49 x}$ and $0$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} - 5103 + 27 \sqrt[3]{x^{2} \cdot 7} - 486 \sqrt[3]{49 x} + 243 \sqrt[3]{x \cdot 49} + 5103$

Step 5.2.4.3

Add $- 5103$ and $5103$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} + 0 + 27 \sqrt[3]{x^{2} \cdot 7} - 486 \sqrt[3]{49 x} + 243 \sqrt[3]{x \cdot 49}$

Step 5.2.4.4

Add $x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x}$ and $0$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 243 \sqrt[3]{49 x} + 27 \sqrt[3]{x^{2} \cdot 7} - 486 \sqrt[3]{49 x} + 243 \sqrt[3]{x \cdot 49}$

Step 5.2.5

Add $- 27 \sqrt[3]{7 x^{2}}$ and $27 \sqrt[3]{x^{2} \cdot 7}$ .

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Step 5.2.5.1

Reorder $x^{2}$ and $7$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 27 \sqrt[3]{7 x^{2}} + 27 \sqrt[3]{7 \cdot x^{2}} + 243 \sqrt[3]{49 x} - 486 \sqrt[3]{49 x} + 243 \sqrt[3]{x \cdot 49}$

Step 5.2.5.2

Add $- 27 \sqrt[3]{7 x^{2}}$ and $27 \sqrt[3]{7 \cdot x^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x + 0 + 243 \sqrt[3]{49 x} - 486 \sqrt[3]{49 x} + 243 \sqrt[3]{x \cdot 49}$

Step 5.2.6

Add $x$ and $0$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x + 243 \sqrt[3]{49 x} - 486 \sqrt[3]{49 x} + 243 \sqrt[3]{x \cdot 49}$

Step 5.2.7

Subtract $486 \sqrt[3]{49 x}$ from $243 \sqrt[3]{49 x}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 243 \sqrt[3]{49 x} + 243 \sqrt[3]{x \cdot 49}$

Step 5.2.8

Add $- 243 \sqrt[3]{49 x}$ and $243 \sqrt[3]{x \cdot 49}$ .

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Step 5.2.8.1

Reorder $x$ and $49$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x - 243 \sqrt[3]{49 x} + 243 \sqrt[3]{49 \cdot x}$

Step 5.2.8.2

Add $- 243 \sqrt[3]{49 x}$ and $243 \sqrt[3]{49 \cdot x}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x + 0$

Step 5.2.9

Add $x$ and $0$ .

$f^{- 1} (\sqrt[3]{\frac{x}{7}} - 9) = x$

Step 5.3

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

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Step 5.3.1

Set up the composite result function.

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

Step 5.3.2

Evaluate $f (7 x^{3} + 189 x^{2} + 1701 x + 5103)$ by substituting in the value of $f^{- 1}$ into $f$ .

$f (7 x^{3} + 189 x^{2} + 1701 x + 5103) = \sqrt[3]{\frac{7 x^{3} + 189 x^{2} + 1701 x + 5103}{7}} - 9$

Step 5.3.3

Simplify each term.

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Step 5.3.3.1

Factor $7$ out of $7 x^{3} + 189 x^{2} + 1701 x + 5103$ .

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Step 5.3.3.1.1

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

$f (7 x^{3} + 189 x^{2} + 1701 x + 5103) = \sqrt[3]{\frac{7 (x^{3}) + 189 x^{2} + 1701 x + 5103}{7}} - 9$

Step 5.3.3.1.2

Factor $7$ out of $189 x^{2}$ .

$f (7 x^{3} + 189 x^{2} + 1701 x + 5103) = \sqrt[3]{\frac{7 (x^{3}) + 7 (27 x^{2}) + 1701 x + 5103}{7}} - 9$

Step 5.3.3.1.3

Factor $7$ out of $1701 x$ .

$f (7 x^{3} + 189 x^{2} + 1701 x + 5103) = \sqrt[3]{\frac{7 (x^{3}) + 7 (27 x^{2}) + 7 (243 x) + 5103}{7}} - 9$

Step 5.3.3.1.4

Factor $7$ out of $5103$ .

$f (7 x^{3} + 189 x^{2} + 1701 x + 5103) = \sqrt[3]{\frac{7 x^{3} + 7 (27 x^{2}) + 7 (243 x) + 7 \cdot 729}{7}} - 9$

Step 5.3.3.1.5

Factor $7$ out of $7 x^{3} + 7 (27 x^{2})$ .

$f (7 x^{3} + 189 x^{2} + 1701 x + 5103) = \sqrt[3]{\frac{7 (x^{3} + 27 x^{2}) + 7 (243 x) + 7 \cdot 729}{7}} - 9$

Step 5.3.3.1.6

Factor $7$ out of $7 (x^{3} + 27 x^{2}) + 7 (243 x)$ .

$f (7 x^{3} + 189 x^{2} + 1701 x + 5103) = \sqrt[3]{\frac{7 (x^{3} + 27 x^{2} + 243 x) + 7 \cdot 729}{7}} - 9$

Step 5.3.3.1.7

Factor $7$ out of $7 (x^{3} + 27 x^{2} + 243 x) + 7 \cdot 729$ .

$f (7 x^{3} + 189 x^{2} + 1701 x + 5103) = \sqrt[3]{\frac{7 (x^{3} + 27 x^{2} + 243 x + 729)}{7}} - 9$

Step 5.3.3.2

Reduce the expression by cancelling the common factors.

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Step 5.3.3.2.1

Reduce the expression $\frac{7 (x^{3} + 27 x^{2} + 243 x + 729)}{7}$ by cancelling the common factors.

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Step 5.3.3.2.1.1

Cancel the common factor.

$f (7 x^{3} + 189 x^{2} + 1701 x + 5103) = \sqrt[3]{\frac{7 (x^{3} + 27 x^{2} + 243 x + 729)}{7}} - 9$

Step 5.3.3.2.1.2

Rewrite the expression.

$f (7 x^{3} + 189 x^{2} + 1701 x + 5103) = \sqrt[3]{\frac{x^{3} + 27 x^{2} + 243 x + 729}{1}} - 9$

Step 5.3.3.2.2

Divide $x^{3} + 27 x^{2} + 243 x + 729$ by $1$ .

$f (7 x^{3} + 189 x^{2} + 1701 x + 5103) = \sqrt[3]{x^{3} + 27 x^{2} + 243 x + 729} - 9$

Step 5.3.3.3

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

$f (7 x^{3} + 189 x^{2} + 1701 x + 5103) = \sqrt[3]{x^{3} + 3 \cdot (9 x^{2}) + 3 \cdot (9^{2} x) + 9^{3}} - 9$

Step 5.3.3.4

Factor $x^{3} + 3 \cdot 9 x^{2} + 3 \cdot 9^{2} x + 9^{3}$ using the binomial theorem.

$f (7 x^{3} + 189 x^{2} + 1701 x + 5103) = \sqrt[3]{{(x + 9)}^{3}} - 9$

Step 5.3.3.5

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

$f (7 x^{3} + 189 x^{2} + 1701 x + 5103) = x + 9 - 9$

Step 5.3.4

Combine the opposite terms in $x + 9 - 9$ .

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Step 5.3.4.1

Subtract $9$ from $9$ .

$f (7 x^{3} + 189 x^{2} + 1701 x + 5103) = x + 0$

Step 5.3.4.2

Add $x$ and $0$ .

$f (7 x^{3} + 189 x^{2} + 1701 x + 5103) = x$

Step 5.4

Since $f^{- 1} (f (x)) = x$ and $f (f^{- 1} (x)) = x$ , then $f^{- 1} (x) = 7 x^{3} + 189 x^{2} + 1701 x + 5103$ is the inverse of $f (x) = \sqrt[3]{\frac{x}{7}} - 9$ .

$f^{- 1} (x) = 7 x^{3} + 189 x^{2} + 1701 x + 5103$