Precalculus Examples

$f (x) = \sqrt[3]{\frac{x}{9}} - 4$

Step 1

Write $f (x) = \sqrt[3]{\frac{x}{9}} - 4$ as an equation.

$y = \sqrt[3]{\frac{x}{9}} - 4$

Step 2

Interchange the variables.

$x = \sqrt[3]{\frac{y}{9}} - 4$

Step 3

Solve for $y$ .

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Step 3.1

Rewrite the equation as $\sqrt[3]{\frac{y}{9}} - 4 = x$ .

$\sqrt[3]{\frac{y}{9}} - 4 = x$

Step 3.2

Add $4$ to both sides of the equation.

$\sqrt[3]{\frac{y}{9}} = x + 4$

Step 3.3

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

${\sqrt[3]{\frac{y}{9}}}^{3} = {(x + 4)}^{3}$

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 $\sqrt[3]{\frac{y}{9}}$ as ${(\frac{y}{9})}^{\frac{1}{3}}$ .

${({(\frac{y}{9})}^{\frac{1}{3}})}^{3} = {(x + 4)}^{3}$

Step 3.4.2

Simplify the left side.

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Step 3.4.2.1

Simplify ${({(\frac{y}{9})}^{\frac{1}{3}})}^{3}$ .

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Step 3.4.2.1.1

Multiply the exponents in ${({(\frac{y}{9})}^{\frac{1}{3}})}^{3}$ .

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Step 3.4.2.1.1.1

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

${(\frac{y}{9})}^{\frac{1}{3} \cdot 3} = {(x + 4)}^{3}$

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.

${(\frac{y}{9})}^{\frac{1}{3} \cdot 3} = {(x + 4)}^{3}$

Step 3.4.2.1.1.2.2

Rewrite the expression.

${(\frac{y}{9})}^{1} = {(x + 4)}^{3}$

Step 3.4.2.1.2

Simplify.

$\frac{y}{9} = {(x + 4)}^{3}$

Step 3.4.3

Simplify the right side.

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Step 3.4.3.1

Simplify ${(x + 4)}^{3}$ .

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Step 3.4.3.1.1

Use the Binomial Theorem.

$\frac{y}{9} = x^{3} + 3 x^{2} \cdot 4 + 3 x \cdot 4^{2} + 4^{3}$

Step 3.4.3.1.2

Simplify each term.

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Step 3.4.3.1.2.1

Multiply $4$ by $3$ .

$\frac{y}{9} = x^{3} + 12 x^{2} + 3 x \cdot 4^{2} + 4^{3}$

Step 3.4.3.1.2.2

Raise $4$ to the power of $2$ .

$\frac{y}{9} = x^{3} + 12 x^{2} + 3 x \cdot 16 + 4^{3}$

Step 3.4.3.1.2.3

Multiply $16$ by $3$ .

$\frac{y}{9} = x^{3} + 12 x^{2} + 48 x + 4^{3}$

Step 3.4.3.1.2.4

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

$\frac{y}{9} = x^{3} + 12 x^{2} + 48 x + 64$

Step 3.5

Solve for $y$ .

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Step 3.5.1

Multiply both sides of the equation by $9$ .

$9 \frac{y}{9} = 9 (x^{3} + 12 x^{2} + 48 x + 64)$

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 $9$ .

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Step 3.5.2.1.1.1

Cancel the common factor.

$9 \frac{y}{9} = 9 (x^{3} + 12 x^{2} + 48 x + 64)$

Step 3.5.2.1.1.2

Rewrite the expression.

$y = 9 (x^{3} + 12 x^{2} + 48 x + 64)$

Step 3.5.2.2

Simplify the right side.

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Step 3.5.2.2.1

Simplify $9 (x^{3} + 12 x^{2} + 48 x + 64)$ .

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Step 3.5.2.2.1.1

Apply the distributive property.

$y = 9 x^{3} + 9 (12 x^{2}) + 9 (48 x) + 9 \cdot 64$

Step 3.5.2.2.1.2

Simplify.

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Step 3.5.2.2.1.2.1

Multiply $12$ by $9$ .

$y = 9 x^{3} + 108 x^{2} + 9 (48 x) + 9 \cdot 64$

Step 3.5.2.2.1.2.2

Multiply $48$ by $9$ .

$y = 9 x^{3} + 108 x^{2} + 432 x + 9 \cdot 64$

Step 3.5.2.2.1.2.3

Multiply $9$ by $64$ .

$y = 9 x^{3} + 108 x^{2} + 432 x + 576$

Step 4

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

$f^{- 1} (x) = 9 x^{3} + 108 x^{2} + 432 x + 576$

Step 5

Verify if $f^{- 1} (x) = 9 x^{3} + 108 x^{2} + 432 x + 576$ is the inverse of $f (x) = \sqrt[3]{\frac{x}{9}} - 4$ .

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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 $f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4)$ by substituting in the value of $f$ into $f^{- 1}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\sqrt[3]{\frac{x}{9}} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

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 $\sqrt[3]{\frac{x}{9}}$ as $\frac{\sqrt[3]{x}}{\sqrt[3]{9}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{\sqrt[3]{x}}{\sqrt[3]{9}} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.2

Multiply $\frac{\sqrt[3]{x}}{\sqrt[3]{9}}$ by $\frac{{\sqrt[3]{9}}^{2}}{{\sqrt[3]{9}}^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{\sqrt[3]{x}}{\sqrt[3]{9}} \cdot \frac{{\sqrt[3]{9}}^{2}}{{\sqrt[3]{9}}^{2}} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.3

Combine and simplify the denominator.

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Step 5.2.3.1.3.1

Multiply $\frac{\sqrt[3]{x}}{\sqrt[3]{9}}$ by $\frac{{\sqrt[3]{9}}^{2}}{{\sqrt[3]{9}}^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{\sqrt[3]{x} {\sqrt[3]{9}}^{2}}{\sqrt[3]{9} {\sqrt[3]{9}}^{2}} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.3.2

Raise $\sqrt[3]{9}$ 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.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{\sqrt[3]{x} {\sqrt[3]{9}}^{2}}{{\sqrt[3]{9}}^{1 + 2}} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.3.4

Add $1$ and $2$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{\sqrt[3]{x} {\sqrt[3]{9}}^{2}}{{\sqrt[3]{9}}^{3}} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.3.5

Rewrite ${\sqrt[3]{9}}^{3}$ as $9$ .

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Step 5.2.3.1.3.5.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[3]{9}$ as $9^{\frac{1}{3}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{\sqrt[3]{x} {\sqrt[3]{9}}^{2}}{{(9^{\frac{1}{3}})}^{3}} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.3.5.2

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{\sqrt[3]{x} {\sqrt[3]{9}}^{2}}{9^{\frac{1}{3} \cdot 3}} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.3.5.3

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{\sqrt[3]{x} {\sqrt[3]{9}}^{2}}{9^{\frac{3}{3}}} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

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.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{\sqrt[3]{x} {\sqrt[3]{9}}^{2}}{9^{\frac{3}{3}}} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.3.5.4.2

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{\sqrt[3]{x} {\sqrt[3]{9}}^{2}}{9} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.3.5.5

Evaluate the exponent.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{\sqrt[3]{x} {\sqrt[3]{9}}^{2}}{9} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.4

Simplify the numerator.

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Step 5.2.3.1.4.1

Rewrite ${\sqrt[3]{9}}^{2}$ as $\sqrt[3]{9^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{\sqrt[3]{x} \sqrt[3]{9^{2}}}{9} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.4.2

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{\sqrt[3]{x} \sqrt[3]{81}}{9} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.4.3

Rewrite $81$ as $3^{3} \cdot 3$ .

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Step 5.2.3.1.4.3.1

Factor $27$ out of $81$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{\sqrt[3]{x} \sqrt[3]{27 (3)}}{9} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.4.3.2

Rewrite $27$ as $3^{3}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{\sqrt[3]{x} \sqrt[3]{3^{3} \cdot 3}}{9} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.4.4

Pull terms out from under the radical.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{\sqrt[3]{x} \cdot (3 \sqrt[3]{3})}{9} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.4.5

Combine using the product rule for radicals.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{3 \sqrt[3]{x \cdot 3}}{9} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.5

Cancel the common factor of $3$ and $9$ .

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Step 5.2.3.1.5.1

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{3 (\sqrt[3]{x \cdot 3})}{9} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.5.2

Cancel the common factors.

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Step 5.2.3.1.5.2.1

Factor $3$ out of $9$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{3 \sqrt[3]{x \cdot 3}}{3 \cdot 3} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.5.2.2

Cancel the common factor.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{3 \sqrt[3]{x \cdot 3}}{3 \cdot 3} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.1.5.2.3

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 {(\frac{\sqrt[3]{x \cdot 3}}{3} - 4)}^{3} + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.2

Use the Binomial Theorem.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 ({(\frac{\sqrt[3]{x \cdot 3}}{3})}^{3} + 3 {(\frac{\sqrt[3]{x \cdot 3}}{3})}^{2} \cdot - 4 + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3

Simplify each term.

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Step 5.2.3.3.1

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{{\sqrt[3]{x \cdot 3}}^{3}}{3^{3}} + 3 {(\frac{\sqrt[3]{x \cdot 3}}{3})}^{2} \cdot - 4 + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.2

Simplify the numerator.

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Step 5.2.3.3.2.1

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

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Step 5.2.3.3.2.1.1

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{{({(x \cdot 3)}^{\frac{1}{3}})}^{3}}{3^{3}} + 3 {(\frac{\sqrt[3]{x \cdot 3}}{3})}^{2} \cdot - 4 + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.2.1.2

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{{(x \cdot 3)}^{\frac{1}{3} \cdot 3}}{3^{3}} + 3 {(\frac{\sqrt[3]{x \cdot 3}}{3})}^{2} \cdot - 4 + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.2.1.3

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{{(x \cdot 3)}^{\frac{3}{3}}}{3^{3}} + 3 {(\frac{\sqrt[3]{x \cdot 3}}{3})}^{2} \cdot - 4 + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

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.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{x \cdot 3}{3^{3}} + 3 {(\frac{\sqrt[3]{x \cdot 3}}{3})}^{2} \cdot - 4 + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.2.1.5

Simplify.

Step 5.2.3.3.2.2

Move $3$ to the left of $x$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{3 x}{3^{3}} + 3 {(\frac{\sqrt[3]{x \cdot 3}}{3})}^{2} \cdot - 4 + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.3

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{3 x}{27} + 3 {(\frac{\sqrt[3]{x \cdot 3}}{3})}^{2} \cdot - 4 + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.4

Cancel the common factor of $3$ and $27$ .

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Step 5.2.3.3.4.1

Factor $3$ out of $3 x$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{3 (x)}{27} + 3 {(\frac{\sqrt[3]{x \cdot 3}}{3})}^{2} \cdot - 4 + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.4.2

Cancel the common factors.

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Step 5.2.3.3.4.2.1

Factor $3$ out of $27$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{3 x}{3 \cdot 9} + 3 {(\frac{\sqrt[3]{x \cdot 3}}{3})}^{2} \cdot - 4 + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.4.2.2

Cancel the common factor.

Step 5.2.3.3.4.2.3

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{x}{9} + 3 {(\frac{\sqrt[3]{x \cdot 3}}{3})}^{2} \cdot - 4 + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.5

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{x}{9} + 3 (\frac{{\sqrt[3]{x \cdot 3}}^{2}}{3^{2}}) \cdot - 4 + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.6

Cancel the common factor of $3$ .

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Step 5.2.3.3.6.1

Factor $3$ out of $3^{2}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{x}{9} + 3 (\frac{{\sqrt[3]{x \cdot 3}}^{2}}{3 \cdot 3}) \cdot - 4 + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.6.2

Cancel the common factor.

Step 5.2.3.3.6.3

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{x}{9} + \frac{{\sqrt[3]{x \cdot 3}}^{2}}{3} \cdot - 4 + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.7

Simplify the numerator.

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Step 5.2.3.3.7.1

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{x}{9} + \frac{\sqrt[3]{{(x \cdot 3)}^{2}}}{3} \cdot - 4 + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.7.2

Apply the product rule to $x \cdot 3$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{x}{9} + \frac{\sqrt[3]{x^{2} \cdot 3^{2}}}{3} \cdot - 4 + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.7.3

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{x}{9} + \frac{\sqrt[3]{x^{2} \cdot 9}}{3} \cdot - 4 + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.8

Combine $\frac{\sqrt[3]{x^{2} \cdot 9}}{3}$ and $- 4$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{x}{9} + \frac{\sqrt[3]{x^{2} \cdot 9} \cdot - 4}{3} + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.9

Move $9$ to the left of $x^{2}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{x}{9} + \frac{\sqrt[3]{9 \cdot x^{2}} \cdot - 4}{3} + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.10

Move $- 4$ to the left of $\sqrt[3]{9 \cdot x^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{x}{9} + \frac{- 4 \cdot \sqrt[3]{9 \cdot x^{2}}}{3} + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.11

Move the negative in front of the fraction.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{x}{9} - \frac{(4) \cdot \sqrt[3]{9 \cdot x^{2}}}{3} + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.12

Cancel the common factor of $3$ .

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Step 5.2.3.3.12.1

Cancel the common factor.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{x}{9} - \frac{4 \sqrt[3]{9 x^{2}}}{3} + 3 (\frac{\sqrt[3]{x \cdot 3}}{3}) \cdot {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.12.2

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{x}{9} - \frac{4 \sqrt[3]{9 x^{2}}}{3} + \sqrt[3]{x \cdot 3} {(- 4)}^{2} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.13

Raise $- 4$ to the power of $2$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{x}{9} - \frac{4 \sqrt[3]{9 x^{2}}}{3} + \sqrt[3]{x \cdot 3} \cdot 16 + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.14

Move $16$ to the left of $\sqrt[3]{x \cdot 3}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{x}{9} - \frac{4 \sqrt[3]{9 x^{2}}}{3} + 16 \cdot \sqrt[3]{x \cdot 3} + {(- 4)}^{3}) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.3.15

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{x}{9} - \frac{4 \sqrt[3]{9 x^{2}}}{3} + 16 \sqrt[3]{x \cdot 3} - 64) + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.4

Apply the distributive property.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = 9 (\frac{x}{9}) + 9 (- \frac{4 \sqrt[3]{9 x^{2}}}{3}) + 9 (16 \sqrt[3]{x \cdot 3}) + 9 \cdot - 64 + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.5

Simplify.

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Step 5.2.3.5.1

Cancel the common factor of $9$ .

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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.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x + 9 (- \frac{4 \sqrt[3]{9 x^{2}}}{3}) + 9 (16 \sqrt[3]{x \cdot 3}) + 9 \cdot - 64 + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.5.2

Cancel the common factor of $3$ .

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Step 5.2.3.5.2.1

Move the leading negative in $- \frac{4 \sqrt[3]{9 x^{2}}}{3}$ into the numerator.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x + 9 (\frac{- 4 \sqrt[3]{9 x^{2}}}{3}) + 9 (16 \sqrt[3]{x \cdot 3}) + 9 \cdot - 64 + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.5.2.2

Factor $3$ out of $9$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x + 3 (3) (\frac{- 4 \sqrt[3]{9 x^{2}}}{3}) + 9 (16 \sqrt[3]{x \cdot 3}) + 9 \cdot - 64 + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.5.2.3

Cancel the common factor.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x + 3 \cdot (3 (\frac{- 4 \sqrt[3]{9 x^{2}}}{3})) + 9 (16 \sqrt[3]{x \cdot 3}) + 9 \cdot - 64 + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.5.2.4

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x + 3 (- 4 \sqrt[3]{9 x^{2}}) + 9 (16 \sqrt[3]{x \cdot 3}) + 9 \cdot - 64 + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.5.3

Multiply $- 4$ by $3$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 9 (16 \sqrt[3]{x \cdot 3}) + 9 \cdot - 64 + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.5.4

Multiply $16$ by $9$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} + 9 \cdot - 64 + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.5.5

Multiply $9$ by $- 64$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\sqrt[3]{\frac{x}{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6

Simplify each term.

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Step 5.2.3.6.1

Rewrite $\sqrt[3]{\frac{x}{9}}$ as $\frac{\sqrt[3]{x}}{\sqrt[3]{9}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{\sqrt[3]{x}}{\sqrt[3]{9}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6.2

Multiply $\frac{\sqrt[3]{x}}{\sqrt[3]{9}}$ by $\frac{{\sqrt[3]{9}}^{2}}{{\sqrt[3]{9}}^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{\sqrt[3]{x}}{\sqrt[3]{9}} \cdot \frac{{\sqrt[3]{9}}^{2}}{{\sqrt[3]{9}}^{2}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6.3

Combine and simplify the denominator.

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Step 5.2.3.6.3.1

Multiply $\frac{\sqrt[3]{x}}{\sqrt[3]{9}}$ by $\frac{{\sqrt[3]{9}}^{2}}{{\sqrt[3]{9}}^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{\sqrt[3]{x} {\sqrt[3]{9}}^{2}}{\sqrt[3]{9} {\sqrt[3]{9}}^{2}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6.3.2

Raise $\sqrt[3]{9}$ 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.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{\sqrt[3]{x} {\sqrt[3]{9}}^{2}}{{\sqrt[3]{9}}^{1 + 2}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6.3.4

Add $1$ and $2$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{\sqrt[3]{x} {\sqrt[3]{9}}^{2}}{{\sqrt[3]{9}}^{3}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6.3.5

Rewrite ${\sqrt[3]{9}}^{3}$ as $9$ .

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Step 5.2.3.6.3.5.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[3]{9}$ as $9^{\frac{1}{3}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{\sqrt[3]{x} {\sqrt[3]{9}}^{2}}{{(9^{\frac{1}{3}})}^{3}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6.3.5.2

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{\sqrt[3]{x} {\sqrt[3]{9}}^{2}}{9^{\frac{1}{3} \cdot 3}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6.3.5.3

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{\sqrt[3]{x} {\sqrt[3]{9}}^{2}}{9^{\frac{3}{3}}} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

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.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{\sqrt[3]{x} {\sqrt[3]{9}}^{2}}{9} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6.3.5.5

Evaluate the exponent.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{\sqrt[3]{x} {\sqrt[3]{9}}^{2}}{9} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6.4

Simplify the numerator.

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Step 5.2.3.6.4.1

Rewrite ${\sqrt[3]{9}}^{2}$ as $\sqrt[3]{9^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{\sqrt[3]{x} \sqrt[3]{9^{2}}}{9} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6.4.2

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{\sqrt[3]{x} \sqrt[3]{81}}{9} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6.4.3

Rewrite $81$ as $3^{3} \cdot 3$ .

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Step 5.2.3.6.4.3.1

Factor $27$ out of $81$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{\sqrt[3]{x} \sqrt[3]{27 (3)}}{9} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6.4.3.2

Rewrite $27$ as $3^{3}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{\sqrt[3]{x} \sqrt[3]{3^{3} \cdot 3}}{9} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6.4.4

Pull terms out from under the radical.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{\sqrt[3]{x} \cdot (3 \sqrt[3]{3})}{9} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6.4.5

Combine using the product rule for radicals.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{3 \sqrt[3]{x \cdot 3}}{9} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6.5

Cancel the common factor of $3$ and $9$ .

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Step 5.2.3.6.5.1

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{3 (\sqrt[3]{x \cdot 3})}{9} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6.5.2

Cancel the common factors.

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Step 5.2.3.6.5.2.1

Factor $3$ out of $9$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{3 \sqrt[3]{x \cdot 3}}{3 \cdot 3} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6.5.2.2

Cancel the common factor.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{3 \sqrt[3]{x \cdot 3}}{3 \cdot 3} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.6.5.2.3

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 {(\frac{\sqrt[3]{x \cdot 3}}{3} - 4)}^{2} + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.7

Rewrite ${(\frac{\sqrt[3]{x \cdot 3}}{3} - 4)}^{2}$ as $(\frac{\sqrt[3]{x \cdot 3}}{3} - 4) (\frac{\sqrt[3]{x \cdot 3}}{3} - 4)$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 ((\frac{\sqrt[3]{x \cdot 3}}{3} - 4) (\frac{\sqrt[3]{x \cdot 3}}{3} - 4)) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.8

Expand $(\frac{\sqrt[3]{x \cdot 3}}{3} - 4) (\frac{\sqrt[3]{x \cdot 3}}{3} - 4)$ using the FOIL Method.

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Step 5.2.3.8.1

Apply the distributive property.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x \cdot 3}}{3} \cdot (\frac{\sqrt[3]{x \cdot 3}}{3} - 4) - 4 (\frac{\sqrt[3]{x \cdot 3}}{3} - 4)) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.8.2

Apply the distributive property.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x \cdot 3}}{3} \cdot \frac{\sqrt[3]{x \cdot 3}}{3} + \frac{\sqrt[3]{x \cdot 3}}{3} \cdot - 4 - 4 (\frac{\sqrt[3]{x \cdot 3}}{3} - 4)) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.8.3

Apply the distributive property.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x \cdot 3}}{3} \cdot \frac{\sqrt[3]{x \cdot 3}}{3} + \frac{\sqrt[3]{x \cdot 3}}{3} \cdot - 4 - 4 \frac{\sqrt[3]{x \cdot 3}}{3} - 4 \cdot - 4) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

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

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Step 5.2.3.9.1.1.1

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x \cdot 3} \sqrt[3]{x \cdot 3}}{3 \cdot 3} + \frac{\sqrt[3]{x \cdot 3}}{3} \cdot - 4 - 4 \frac{\sqrt[3]{x \cdot 3}}{3} - 4 \cdot - 4) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.9.1.1.2

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

Step 5.2.3.9.1.1.3

Raise $\sqrt[3]{x \cdot 3}$ 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.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{{\sqrt[3]{x \cdot 3}}^{1 + 1}}{3 \cdot 3} + \frac{\sqrt[3]{x \cdot 3}}{3} \cdot - 4 - 4 \frac{\sqrt[3]{x \cdot 3}}{3} - 4 \cdot - 4) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.9.1.1.5

Add $1$ and $1$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{{\sqrt[3]{x \cdot 3}}^{2}}{3 \cdot 3} + \frac{\sqrt[3]{x \cdot 3}}{3} \cdot - 4 - 4 \frac{\sqrt[3]{x \cdot 3}}{3} - 4 \cdot - 4) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.9.1.1.6

Multiply $3$ by $3$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{{\sqrt[3]{x \cdot 3}}^{2}}{9} + \frac{\sqrt[3]{x \cdot 3}}{3} \cdot - 4 - 4 \frac{\sqrt[3]{x \cdot 3}}{3} - 4 \cdot - 4) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.9.1.2

Simplify the numerator.

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Step 5.2.3.9.1.2.1

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{{(x \cdot 3)}^{2}}}{9} + \frac{\sqrt[3]{x \cdot 3}}{3} \cdot - 4 - 4 \frac{\sqrt[3]{x \cdot 3}}{3} - 4 \cdot - 4) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.9.1.2.2

Apply the product rule to $x \cdot 3$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x^{2} \cdot 3^{2}}}{9} + \frac{\sqrt[3]{x \cdot 3}}{3} \cdot - 4 - 4 \frac{\sqrt[3]{x \cdot 3}}{3} - 4 \cdot - 4) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.9.1.2.3

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x^{2} \cdot 9}}{9} + \frac{\sqrt[3]{x \cdot 3}}{3} \cdot - 4 - 4 \frac{\sqrt[3]{x \cdot 3}}{3} - 4 \cdot - 4) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.9.1.3

Combine $\frac{\sqrt[3]{x \cdot 3}}{3}$ and $- 4$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x^{2} \cdot 9}}{9} + \frac{\sqrt[3]{x \cdot 3} \cdot - 4}{3} - 4 \frac{\sqrt[3]{x \cdot 3}}{3} - 4 \cdot - 4) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.9.1.4

Move $3$ to the left of $x$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x^{2} \cdot 9}}{9} + \frac{\sqrt[3]{3 \cdot x} \cdot - 4}{3} - 4 \frac{\sqrt[3]{x \cdot 3}}{3} - 4 \cdot - 4) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.9.1.5

Move $- 4$ to the left of $\sqrt[3]{3 \cdot x}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x^{2} \cdot 9}}{9} + \frac{- 4 \cdot \sqrt[3]{3 \cdot x}}{3} - 4 \frac{\sqrt[3]{x \cdot 3}}{3} - 4 \cdot - 4) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.9.1.6

Move the negative in front of the fraction.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x^{2} \cdot 9}}{9} - \frac{(4) \cdot \sqrt[3]{3 \cdot x}}{3} - 4 \frac{\sqrt[3]{x \cdot 3}}{3} - 4 \cdot - 4) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.9.1.7

Combine $- 4$ and $\frac{\sqrt[3]{x \cdot 3}}{3}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x^{2} \cdot 9}}{9} - \frac{4 \sqrt[3]{3 x}}{3} + \frac{- 4 \sqrt[3]{x \cdot 3}}{3} - 4 \cdot - 4) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.9.1.8

Move $3$ to the left of $x$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x^{2} \cdot 9}}{9} - \frac{4 \sqrt[3]{3 x}}{3} + \frac{- 4 \sqrt[3]{3 \cdot x}}{3} - 4 \cdot - 4) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.9.1.9

Move the negative in front of the fraction.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x^{2} \cdot 9}}{9} - \frac{4 \sqrt[3]{3 x}}{3} - \frac{(4) \sqrt[3]{3 \cdot x}}{3} - 4 \cdot - 4) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.9.1.10

Multiply $- 4$ by $- 4$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x^{2} \cdot 9}}{9} - \frac{4 \sqrt[3]{3 x}}{3} - \frac{4 \sqrt[3]{3 x}}{3} + 16) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.9.2

Subtract $\frac{4 \sqrt[3]{3 x}}{3}$ from $- \frac{4 \sqrt[3]{3 x}}{3}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x^{2} \cdot 9}}{9} - 2 \frac{4 \sqrt[3]{3 x}}{3} + 16) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.10

Simplify each term.

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Step 5.2.3.10.1

Multiply $- 2 \frac{4 \sqrt[3]{3 x}}{3}$ .

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Step 5.2.3.10.1.1

Combine $- 2$ and $\frac{4 \sqrt[3]{3 x}}{3}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x^{2} \cdot 9}}{9} + \frac{- 2 (4 \sqrt[3]{3 x})}{3} + 16) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.10.1.2

Multiply $4$ by $- 2$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x^{2} \cdot 9}}{9} + \frac{- 8 \sqrt[3]{3 x}}{3} + 16) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.10.2

Move the negative in front of the fraction.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x^{2} \cdot 9}}{9} - \frac{8 \sqrt[3]{3 x}}{3} + 16) + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.11

Apply the distributive property.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 108 (\frac{\sqrt[3]{x^{2} \cdot 9}}{9}) + 108 (- \frac{8 \sqrt[3]{3 x}}{3}) + 108 \cdot 16 + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.12

Simplify.

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Step 5.2.3.12.1

Cancel the common factor of $9$ .

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Step 5.2.3.12.1.1

Factor $9$ out of $108$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 9 (12) (\frac{\sqrt[3]{x^{2} \cdot 9}}{9}) + 108 (- \frac{8 \sqrt[3]{3 x}}{3}) + 108 \cdot 16 + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.12.1.2

Cancel the common factor.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 9 \cdot (12 (\frac{\sqrt[3]{x^{2} \cdot 9}}{9})) + 108 (- \frac{8 \sqrt[3]{3 x}}{3}) + 108 \cdot 16 + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.12.1.3

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} + 108 (- \frac{8 \sqrt[3]{3 x}}{3}) + 108 \cdot 16 + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.12.2

Cancel the common factor of $3$ .

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Step 5.2.3.12.2.1

Move the leading negative in $- \frac{8 \sqrt[3]{3 x}}{3}$ into the numerator.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} + 108 (\frac{- 8 \sqrt[3]{3 x}}{3}) + 108 \cdot 16 + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.12.2.2

Factor $3$ out of $108$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} + 3 (36) (\frac{- 8 \sqrt[3]{3 x}}{3}) + 108 \cdot 16 + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.12.2.3

Cancel the common factor.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} + 3 \cdot (36 (\frac{- 8 \sqrt[3]{3 x}}{3})) + 108 \cdot 16 + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.12.2.4

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} + 36 (- 8 \sqrt[3]{3 x}) + 108 \cdot 16 + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.12.3

Multiply $- 8$ by $36$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x} + 108 \cdot 16 + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.12.4

Multiply $108$ by $16$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x} + 1728 + 432 (\sqrt[3]{\frac{x}{9}} - 4) + 576$

Step 5.2.3.13

Simplify each term.

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Step 5.2.3.13.1

Rewrite $\sqrt[3]{\frac{x}{9}}$ as $\frac{\sqrt[3]{x}}{\sqrt[3]{9}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x} + 1728 + 432 (\frac{\sqrt[3]{x}}{\sqrt[3]{9}} - 4) + 576$

Step 5.2.3.13.2

Multiply $\frac{\sqrt[3]{x}}{\sqrt[3]{9}}$ by $\frac{{\sqrt[3]{9}}^{2}}{{\sqrt[3]{9}}^{2}}$ .

Step 5.2.3.13.3

Combine and simplify the denominator.

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Step 5.2.3.13.3.1

Multiply $\frac{\sqrt[3]{x}}{\sqrt[3]{9}}$ by $\frac{{\sqrt[3]{9}}^{2}}{{\sqrt[3]{9}}^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x} + 1728 + 432 (\frac{\sqrt[3]{x} {\sqrt[3]{9}}^{2}}{\sqrt[3]{9} {\sqrt[3]{9}}^{2}} - 4) + 576$

Step 5.2.3.13.3.2

Raise $\sqrt[3]{9}$ 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 ${\sqrt[3]{9}}^{3}$ as $9$ .

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Step 5.2.3.13.3.5.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[3]{9}$ as $9^{\frac{1}{3}}$ .

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 ${\sqrt[3]{9}}^{2}$ as $\sqrt[3]{9^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x} + 1728 + 432 (\frac{\sqrt[3]{x} \sqrt[3]{9^{2}}}{9} - 4) + 576$

Step 5.2.3.13.4.2

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

Step 5.2.3.13.4.3

Rewrite $81$ as $3^{3} \cdot 3$ .

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Step 5.2.3.13.4.3.1

Factor $27$ out of $81$ .

Step 5.2.3.13.4.3.2

Rewrite $27$ as $3^{3}$ .

Step 5.2.3.13.4.4

Pull terms out from under the radical.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x} + 1728 + 432 (\frac{\sqrt[3]{x} \cdot (3 \sqrt[3]{3})}{9} - 4) + 576$

Step 5.2.3.13.4.5

Combine using the product rule for radicals.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x} + 1728 + 432 (\frac{3 \sqrt[3]{x \cdot 3}}{9} - 4) + 576$

Step 5.2.3.13.5

Cancel the common factor of $3$ and $9$ .

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Step 5.2.3.13.5.1

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

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x} + 1728 + 432 (\frac{3 (\sqrt[3]{x \cdot 3})}{9} - 4) + 576$

Step 5.2.3.13.5.2

Cancel the common factors.

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Step 5.2.3.13.5.2.1

Factor $3$ out of $9$ .

Step 5.2.3.13.5.2.2

Cancel the common factor.

Step 5.2.3.13.5.2.3

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x} + 1728 + 432 (\frac{\sqrt[3]{x \cdot 3}}{3} - 4) + 576$

Step 5.2.3.14

Apply the distributive property.

Step 5.2.3.15

Cancel the common factor of $3$ .

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Step 5.2.3.15.1

Factor $3$ out of $432$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x} + 1728 + 3 (144) (\frac{\sqrt[3]{x \cdot 3}}{3}) + 432 \cdot - 4 + 576$

Step 5.2.3.15.2

Cancel the common factor.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x} + 1728 + 3 \cdot (144 (\frac{\sqrt[3]{x \cdot 3}}{3})) + 432 \cdot - 4 + 576$

Step 5.2.3.15.3

Rewrite the expression.

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x} + 1728 + 144 \sqrt[3]{x \cdot 3} + 432 \cdot - 4 + 576$

Step 5.2.3.16

Multiply $432$ by $- 4$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x} + 1728 + 144 \sqrt[3]{x \cdot 3} - 1728 + 576$

Step 5.2.4

Combine the opposite terms in $x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x} + 1728 + 144 \sqrt[3]{x \cdot 3} - 1728 + 576$ .

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Step 5.2.4.1

Subtract $1728$ from $1728$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x} + 0 + 144 \sqrt[3]{x \cdot 3} + 576$

Step 5.2.4.2

Add $x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x}$ and $0$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} - 576 + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x} + 144 \sqrt[3]{x \cdot 3} + 576$

Step 5.2.4.3

Add $- 576$ and $576$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} + 0 + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x} + 144 \sqrt[3]{x \cdot 3}$

Step 5.2.4.4

Add $x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3}$ and $0$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 144 \sqrt[3]{x \cdot 3} + 12 \sqrt[3]{x^{2} \cdot 9} - 288 \sqrt[3]{3 x} + 144 \sqrt[3]{x \cdot 3}$

Step 5.2.5

Add $- 12 \sqrt[3]{9 x^{2}}$ and $12 \sqrt[3]{x^{2} \cdot 9}$ .

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Step 5.2.5.1

Reorder $x^{2}$ and $9$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 12 \sqrt[3]{9 x^{2}} + 12 \sqrt[3]{9 \cdot x^{2}} + 144 \sqrt[3]{x \cdot 3} - 288 \sqrt[3]{3 x} + 144 \sqrt[3]{x \cdot 3}$

Step 5.2.5.2

Add $- 12 \sqrt[3]{9 x^{2}}$ and $12 \sqrt[3]{9 \cdot x^{2}}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x + 0 + 144 \sqrt[3]{x \cdot 3} - 288 \sqrt[3]{3 x} + 144 \sqrt[3]{x \cdot 3}$

Step 5.2.6

Add $x$ and $0$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x + 144 \sqrt[3]{x \cdot 3} - 288 \sqrt[3]{3 x} + 144 \sqrt[3]{x \cdot 3}$

Step 5.2.7

Subtract $288 \sqrt[3]{3 x}$ from $144 \sqrt[3]{x \cdot 3}$ .

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Step 5.2.7.1

Reorder $x$ and $3$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x + 144 \sqrt[3]{3 \cdot x} - 288 \sqrt[3]{3 x} + 144 \sqrt[3]{x \cdot 3}$

Step 5.2.7.2

Subtract $288 \sqrt[3]{3 x}$ from $144 \sqrt[3]{3 \cdot x}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 144 \sqrt[3]{3 \cdot x} + 144 \sqrt[3]{x \cdot 3}$

Step 5.2.8

Add $- 144 \sqrt[3]{3 \cdot x}$ and $144 \sqrt[3]{x \cdot 3}$ .

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Step 5.2.8.1

Reorder $x$ and $3$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x - 144 \sqrt[3]{3 \cdot x} + 144 \sqrt[3]{3 \cdot x}$

Step 5.2.8.2

Add $- 144 \sqrt[3]{3 \cdot x}$ and $144 \sqrt[3]{3 \cdot x}$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x + 0$

Step 5.2.9

Add $x$ and $0$ .

$f^{- 1} (\sqrt[3]{\frac{x}{9}} - 4) = x$

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 $f (9 x^{3} + 108 x^{2} + 432 x + 576)$ by substituting in the value of $f^{- 1}$ into $f$ .

$f (9 x^{3} + 108 x^{2} + 432 x + 576) = \sqrt[3]{\frac{9 x^{3} + 108 x^{2} + 432 x + 576}{9}} - 4$

Step 5.3.3

Simplify each term.

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Step 5.3.3.1

Factor $9$ out of $9 x^{3} + 108 x^{2} + 432 x + 576$ .

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Step 5.3.3.1.1

Factor $9$ out of $9 x^{3}$ .

$f (9 x^{3} + 108 x^{2} + 432 x + 576) = \sqrt[3]{\frac{9 (x^{3}) + 108 x^{2} + 432 x + 576}{9}} - 4$

Step 5.3.3.1.2

Factor $9$ out of $108 x^{2}$ .

$f (9 x^{3} + 108 x^{2} + 432 x + 576) = \sqrt[3]{\frac{9 (x^{3}) + 9 (12 x^{2}) + 432 x + 576}{9}} - 4$

Step 5.3.3.1.3

Factor $9$ out of $432 x$ .

$f (9 x^{3} + 108 x^{2} + 432 x + 576) = \sqrt[3]{\frac{9 (x^{3}) + 9 (12 x^{2}) + 9 (48 x) + 576}{9}} - 4$

Step 5.3.3.1.4

Factor $9$ out of $576$ .

$f (9 x^{3} + 108 x^{2} + 432 x + 576) = \sqrt[3]{\frac{9 x^{3} + 9 (12 x^{2}) + 9 (48 x) + 9 \cdot 64}{9}} - 4$

Step 5.3.3.1.5

Factor $9$ out of $9 x^{3} + 9 (12 x^{2})$ .

$f (9 x^{3} + 108 x^{2} + 432 x + 576) = \sqrt[3]{\frac{9 (x^{3} + 12 x^{2}) + 9 (48 x) + 9 \cdot 64}{9}} - 4$

Step 5.3.3.1.6

Factor $9$ out of $9 (x^{3} + 12 x^{2}) + 9 (48 x)$ .

$f (9 x^{3} + 108 x^{2} + 432 x + 576) = \sqrt[3]{\frac{9 (x^{3} + 12 x^{2} + 48 x) + 9 \cdot 64}{9}} - 4$

Step 5.3.3.1.7

Factor $9$ out of $9 (x^{3} + 12 x^{2} + 48 x) + 9 \cdot 64$ .

$f (9 x^{3} + 108 x^{2} + 432 x + 576) = \sqrt[3]{\frac{9 (x^{3} + 12 x^{2} + 48 x + 64)}{9}} - 4$

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 $\frac{9 (x^{3} + 12 x^{2} + 48 x + 64)}{9}$ by cancelling the common factors.

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Step 5.3.3.2.1.1

Cancel the common factor.

$f (9 x^{3} + 108 x^{2} + 432 x + 576) = \sqrt[3]{\frac{9 (x^{3} + 12 x^{2} + 48 x + 64)}{9}} - 4$

Step 5.3.3.2.1.2

Rewrite the expression.

$f (9 x^{3} + 108 x^{2} + 432 x + 576) = \sqrt[3]{\frac{x^{3} + 12 x^{2} + 48 x + 64}{1}} - 4$

Step 5.3.3.2.2

Divide $x^{3} + 12 x^{2} + 48 x + 64$ by $1$ .

$f (9 x^{3} + 108 x^{2} + 432 x + 576) = \sqrt[3]{x^{3} + 12 x^{2} + 48 x + 64} - 4$

Step 5.3.3.3

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

$f (9 x^{3} + 108 x^{2} + 432 x + 576) = \sqrt[3]{x^{3} + 3 \cdot (4 x^{2}) + 3 \cdot (4^{2} x) + 4^{3}} - 4$

Step 5.3.3.4

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

$f (9 x^{3} + 108 x^{2} + 432 x + 576) = \sqrt[3]{{(x + 4)}^{3}} - 4$

Step 5.3.3.5

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

$f (9 x^{3} + 108 x^{2} + 432 x + 576) = x + 4 - 4$

Step 5.3.4

Combine the opposite terms in $x + 4 - 4$ .

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Step 5.3.4.1

Subtract $4$ from $4$ .

$f (9 x^{3} + 108 x^{2} + 432 x + 576) = x + 0$

Step 5.3.4.2

Add $x$ and $0$ .

$f (9 x^{3} + 108 x^{2} + 432 x + 576) = x$

Step 5.4

Since $f^{- 1} (f (x)) = x$ and $f (f^{- 1} (x)) = x$ , then $f^{- 1} (x) = 9 x^{3} + 108 x^{2} + 432 x + 576$ is the inverse of $f (x) = \sqrt[3]{\frac{x}{9}} - 4$ .

$f^{- 1} (x) = 9 x^{3} + 108 x^{2} + 432 x + 576$