Precalculus Examples

$f (x) = 10 \sqrt[3]{x} - 5$ ; find $f^{- 1} (x)$

Step 1

Write $f (x) = 10 \sqrt[3]{x} - 5$ as an equation.

$y = 10 \sqrt[3]{x} - 5$

Step 2

Interchange the variables.

$x = 10 \sqrt[3]{y} - 5$

Step 3

Solve for $y$ .

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Step 3.1

Rewrite the equation as $10 \sqrt[3]{y} - 5 = x$ .

$10 \sqrt[3]{y} - 5 = x$

Step 3.2

Add $5$ to both sides of the equation.

$10 \sqrt[3]{y} = x + 5$

Step 3.3

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

${(10 \sqrt[3]{y})}^{3} = {(x + 5)}^{3}$

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

${(10 y^{\frac{1}{3}})}^{3} = {(x + 5)}^{3}$

Step 3.4.2

Simplify the left side.

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Step 3.4.2.1

Simplify ${(10 y^{\frac{1}{3}})}^{3}$ .

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Step 3.4.2.1.1

Apply the product rule to $10 y^{\frac{1}{3}}$ .

$10^{3} {(y^{\frac{1}{3}})}^{3} = {(x + 5)}^{3}$

Step 3.4.2.1.2

Raise $10$ to the power of $3$ .

$1000 {(y^{\frac{1}{3}})}^{3} = {(x + 5)}^{3}$

Step 3.4.2.1.3

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

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Step 3.4.2.1.3.1

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

$1000 y^{\frac{1}{3} \cdot 3} = {(x + 5)}^{3}$

Step 3.4.2.1.3.2

Cancel the common factor of $3$ .

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Step 3.4.2.1.3.2.1

Cancel the common factor.

$1000 y^{\frac{1}{3} \cdot 3} = {(x + 5)}^{3}$

Step 3.4.2.1.3.2.2

Rewrite the expression.

$1000 y^{1} = {(x + 5)}^{3}$

Step 3.4.2.1.4

Simplify.

$1000 y = {(x + 5)}^{3}$

Step 3.4.3

Simplify the right side.

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Step 3.4.3.1

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

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Step 3.4.3.1.1

Use the Binomial Theorem.

$1000 y = x^{3} + 3 x^{2} \cdot 5 + 3 x \cdot 5^{2} + 5^{3}$

Step 3.4.3.1.2

Simplify each term.

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Step 3.4.3.1.2.1

Multiply $5$ by $3$ .

$1000 y = x^{3} + 15 x^{2} + 3 x \cdot 5^{2} + 5^{3}$

Step 3.4.3.1.2.2

Raise $5$ to the power of $2$ .

$1000 y = x^{3} + 15 x^{2} + 3 x \cdot 25 + 5^{3}$

Step 3.4.3.1.2.3

Multiply $25$ by $3$ .

$1000 y = x^{3} + 15 x^{2} + 75 x + 5^{3}$

Step 3.4.3.1.2.4

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

$1000 y = x^{3} + 15 x^{2} + 75 x + 125$

Step 3.5

Divide each term in $1000 y = x^{3} + 15 x^{2} + 75 x + 125$ by $1000$ and simplify.

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Step 3.5.1

Divide each term in $1000 y = x^{3} + 15 x^{2} + 75 x + 125$ by $1000$ .

$\frac{1000 y}{1000} = \frac{x^{3}}{1000} + \frac{15 x^{2}}{1000} + \frac{75 x}{1000} + \frac{125}{1000}$

Step 3.5.2

Simplify the left side.

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Step 3.5.2.1

Cancel the common factor of $1000$ .

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Step 3.5.2.1.1

Cancel the common factor.

$\frac{1000 y}{1000} = \frac{x^{3}}{1000} + \frac{15 x^{2}}{1000} + \frac{75 x}{1000} + \frac{125}{1000}$

Step 3.5.2.1.2

Divide $y$ by $1$ .

$y = \frac{x^{3}}{1000} + \frac{15 x^{2}}{1000} + \frac{75 x}{1000} + \frac{125}{1000}$

Step 3.5.3

Simplify the right side.

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Step 3.5.3.1

Simplify each term.

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Step 3.5.3.1.1

Cancel the common factor of $15$ and $1000$ .

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Step 3.5.3.1.1.1

Factor $5$ out of $15 x^{2}$ .

$y = \frac{x^{3}}{1000} + \frac{5 (3 x^{2})}{1000} + \frac{75 x}{1000} + \frac{125}{1000}$

Step 3.5.3.1.1.2

Cancel the common factors.

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Step 3.5.3.1.1.2.1

Factor $5$ out of $1000$ .

$y = \frac{x^{3}}{1000} + \frac{5 (3 x^{2})}{5 (200)} + \frac{75 x}{1000} + \frac{125}{1000}$

Step 3.5.3.1.1.2.2

Cancel the common factor.

$y = \frac{x^{3}}{1000} + \frac{5 (3 x^{2})}{5 \cdot 200} + \frac{75 x}{1000} + \frac{125}{1000}$

Step 3.5.3.1.1.2.3

Rewrite the expression.

$y = \frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{75 x}{1000} + \frac{125}{1000}$

Step 3.5.3.1.2

Cancel the common factor of $75$ and $1000$ .

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Step 3.5.3.1.2.1

Factor $25$ out of $75 x$ .

$y = \frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{25 (3 x)}{1000} + \frac{125}{1000}$

Step 3.5.3.1.2.2

Cancel the common factors.

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Step 3.5.3.1.2.2.1

Factor $25$ out of $1000$ .

$y = \frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{25 (3 x)}{25 (40)} + \frac{125}{1000}$

Step 3.5.3.1.2.2.2

Cancel the common factor.

$y = \frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{25 (3 x)}{25 \cdot 40} + \frac{125}{1000}$

Step 3.5.3.1.2.2.3

Rewrite the expression.

$y = \frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{125}{1000}$

Step 3.5.3.1.3

Cancel the common factor of $125$ and $1000$ .

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Step 3.5.3.1.3.1

Factor $125$ out of $125$ .

$y = \frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{125 (1)}{1000}$

Step 3.5.3.1.3.2

Cancel the common factors.

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Step 3.5.3.1.3.2.1

Factor $125$ out of $1000$ .

$y = \frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{125 \cdot 1}{125 \cdot 8}$

Step 3.5.3.1.3.2.2

Cancel the common factor.

$y = \frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{125 \cdot 1}{125 \cdot 8}$

Step 3.5.3.1.3.2.3

Rewrite the expression.

$y = \frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}$

Step 4

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

$f^{- 1} (x) = \frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}$

Step 5

Verify if $f^{- 1} (x) = \frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}$ is the inverse of $f (x) = 10 \sqrt[3]{x} - 5$ .

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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 $f^{- 1} (10 \sqrt[3]{x} - 5)$ by substituting in the value of $f$ into $f^{- 1}$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(10 \sqrt[3]{x} - 5)}^{3}}{1000} + \frac{3 {(10 \sqrt[3]{x} - 5)}^{2}}{200} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3

Simplify terms.

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Step 5.2.3.1

Simplify each term.

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Step 5.2.3.1.1

Simplify the numerator.

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Step 5.2.3.1.1.1

Factor $5$ out of $10 \sqrt[3]{x} - 5$ .

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Step 5.2.3.1.1.1.1

Factor $5$ out of $10 \sqrt[3]{x}$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(5 (2 \sqrt[3]{x}) - 5)}^{3}}{1000} + \frac{3 {(10 \sqrt[3]{x} - 5)}^{2}}{200} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.1.1.2

Factor $5$ out of $- 5$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(5 (2 \sqrt[3]{x}) + 5 (- 1))}^{3}}{1000} + \frac{3 {(10 \sqrt[3]{x} - 5)}^{2}}{200} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.1.1.3

Factor $5$ out of $5 (2 \sqrt[3]{x}) + 5 (- 1)$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(5 (2 \sqrt[3]{x} - 1))}^{3}}{1000} + \frac{3 {(10 \sqrt[3]{x} - 5)}^{2}}{200} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.1.2

Apply the product rule to $5 (2 \sqrt[3]{x} - 1)$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{5^{3} {(2 \sqrt[3]{x} - 1)}^{3}}{1000} + \frac{3 {(10 \sqrt[3]{x} - 5)}^{2}}{200} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.1.3

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

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{125 {(2 \sqrt[3]{x} - 1)}^{3}}{1000} + \frac{3 {(10 \sqrt[3]{x} - 5)}^{2}}{200} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.2

Cancel the common factor of $125$ and $1000$ .

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Step 5.2.3.1.2.1

Factor $125$ out of $125 {(2 \sqrt[3]{x} - 1)}^{3}$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{125 ({(2 \sqrt[3]{x} - 1)}^{3})}{1000} + \frac{3 {(10 \sqrt[3]{x} - 5)}^{2}}{200} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.2.2

Cancel the common factors.

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Step 5.2.3.1.2.2.1

Factor $125$ out of $1000$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{125 {(2 \sqrt[3]{x} - 1)}^{3}}{125 \cdot 8} + \frac{3 {(10 \sqrt[3]{x} - 5)}^{2}}{200} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.2.2.2

Cancel the common factor.

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{125 {(2 \sqrt[3]{x} - 1)}^{3}}{125 \cdot 8} + \frac{3 {(10 \sqrt[3]{x} - 5)}^{2}}{200} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.2.2.3

Rewrite the expression.

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3}}{8} + \frac{3 {(10 \sqrt[3]{x} - 5)}^{2}}{200} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.3

Simplify the numerator.

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Step 5.2.3.1.3.1

Factor $5$ out of $10 \sqrt[3]{x} - 5$ .

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Step 5.2.3.1.3.1.1

Factor $5$ out of $10 \sqrt[3]{x}$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3}}{8} + \frac{3 {(5 (2 \sqrt[3]{x}) - 5)}^{2}}{200} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.3.1.2

Factor $5$ out of $- 5$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3}}{8} + \frac{3 {(5 (2 \sqrt[3]{x}) + 5 (- 1))}^{2}}{200} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.3.1.3

Factor $5$ out of $5 (2 \sqrt[3]{x}) + 5 (- 1)$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3}}{8} + \frac{3 {(5 (2 \sqrt[3]{x} - 1))}^{2}}{200} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.3.2

Apply the product rule to $5 (2 \sqrt[3]{x} - 1)$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3}}{8} + \frac{3 \cdot (5^{2} {(2 \sqrt[3]{x} - 1)}^{2})}{200} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.3.3

Raise $5$ to the power of $2$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3}}{8} + \frac{3 \cdot (25 {(2 \sqrt[3]{x} - 1)}^{2})}{200} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.3.4

Multiply $3$ by $25$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3}}{8} + \frac{75 {(2 \sqrt[3]{x} - 1)}^{2}}{200} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.4

Cancel the common factor of $75$ and $200$ .

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Step 5.2.3.1.4.1

Factor $25$ out of $75 {(2 \sqrt[3]{x} - 1)}^{2}$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3}}{8} + \frac{25 (3 {(2 \sqrt[3]{x} - 1)}^{2})}{200} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.4.2

Cancel the common factors.

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Step 5.2.3.1.4.2.1

Factor $25$ out of $200$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3}}{8} + \frac{25 (3 {(2 \sqrt[3]{x} - 1)}^{2})}{25 (8)} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.4.2.2

Cancel the common factor.

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3}}{8} + \frac{25 (3 {(2 \sqrt[3]{x} - 1)}^{2})}{25 \cdot 8} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.4.2.3

Rewrite the expression.

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3}}{8} + \frac{3 {(2 \sqrt[3]{x} - 1)}^{2}}{8} + \frac{3 (10 \sqrt[3]{x} - 5)}{40} + \frac{1}{8}$

Step 5.2.3.1.5

Cancel the common factor of $10 \sqrt[3]{x} - 5$ and $40$ .

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Step 5.2.3.1.5.1

Factor $5$ out of $3 (10 \sqrt[3]{x} - 5)$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3}}{8} + \frac{3 {(2 \sqrt[3]{x} - 1)}^{2}}{8} + \frac{5 (3 (2 \sqrt[3]{x} - 1))}{40} + \frac{1}{8}$

Step 5.2.3.1.5.2

Cancel the common factors.

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Step 5.2.3.1.5.2.1

Factor $5$ out of $40$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3}}{8} + \frac{3 {(2 \sqrt[3]{x} - 1)}^{2}}{8} + \frac{5 (3 (2 \sqrt[3]{x} - 1))}{5 (8)} + \frac{1}{8}$

Step 5.2.3.1.5.2.2

Cancel the common factor.

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3}}{8} + \frac{3 {(2 \sqrt[3]{x} - 1)}^{2}}{8} + \frac{5 (3 (2 \sqrt[3]{x} - 1))}{5 \cdot 8} + \frac{1}{8}$

Step 5.2.3.1.5.2.3

Rewrite the expression.

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3}}{8} + \frac{3 {(2 \sqrt[3]{x} - 1)}^{2}}{8} + \frac{3 (2 \sqrt[3]{x} - 1)}{8} + \frac{1}{8}$

Step 5.2.3.2

Combine the numerators over the common denominator.

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3} + 3 {(2 \sqrt[3]{x} - 1)}^{2} + 3 (2 \sqrt[3]{x} - 1) + 1}{8}$

Step 5.2.3.3

Simplify each term.

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Step 5.2.3.3.1

Rewrite ${(2 \sqrt[3]{x} - 1)}^{2}$ as $(2 \sqrt[3]{x} - 1) (2 \sqrt[3]{x} - 1)$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3} + 3 ((2 \sqrt[3]{x} - 1) (2 \sqrt[3]{x} - 1)) + 3 (2 \sqrt[3]{x} - 1) + 1}{8}$

Step 5.2.3.3.2

Expand $(2 \sqrt[3]{x} - 1) (2 \sqrt[3]{x} - 1)$ using the FOIL Method.

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Step 5.2.3.3.2.1

Apply the distributive property.

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3} + 3 (2 \sqrt[3]{x} (2 \sqrt[3]{x} - 1) - 1 (2 \sqrt[3]{x} - 1)) + 3 (2 \sqrt[3]{x} - 1) + 1}{8}$

Step 5.2.3.3.2.2

Apply the distributive property.

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3} + 3 (2 \sqrt[3]{x} (2 \sqrt[3]{x}) + 2 \sqrt[3]{x} \cdot - 1 - 1 (2 \sqrt[3]{x} - 1)) + 3 (2 \sqrt[3]{x} - 1) + 1}{8}$

Step 5.2.3.3.2.3

Apply the distributive property.

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3} + 3 (2 \sqrt[3]{x} (2 \sqrt[3]{x}) + 2 \sqrt[3]{x} \cdot - 1 - 1 (2 \sqrt[3]{x}) - 1 \cdot - 1) + 3 (2 \sqrt[3]{x} - 1) + 1}{8}$

Step 5.2.3.3.3

Simplify and combine like terms.

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Step 5.2.3.3.3.1

Simplify each term.

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Step 5.2.3.3.3.1.1

Multiply $2 \sqrt[3]{x} (2 \sqrt[3]{x})$ .

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Step 5.2.3.3.3.1.1.1

Multiply $2$ by $2$ .

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

Step 5.2.3.3.3.1.1.2

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

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

Step 5.2.3.3.3.1.1.3

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

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

Step 5.2.3.3.3.1.1.4

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

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

Step 5.2.3.3.3.1.1.5

Add $1$ and $1$ .

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

Step 5.2.3.3.3.1.2

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

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

Step 5.2.3.3.3.1.3

Multiply $- 1$ by $2$ .

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

Step 5.2.3.3.3.1.4

Multiply $2$ by $- 1$ .

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

Step 5.2.3.3.3.1.5

Multiply $- 1$ by $- 1$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3} + 3 (4 \sqrt[3]{x^{2}} - 2 \sqrt[3]{x} - 2 \sqrt[3]{x} + 1) + 3 (2 \sqrt[3]{x} - 1) + 1}{8}$

Step 5.2.3.3.3.2

Subtract $2 \sqrt[3]{x}$ from $- 2 \sqrt[3]{x}$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3} + 3 (4 \sqrt[3]{x^{2}} - 4 \sqrt[3]{x} + 1) + 3 (2 \sqrt[3]{x} - 1) + 1}{8}$

Step 5.2.3.3.4

Apply the distributive property.

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

Step 5.2.3.3.5

Simplify.

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Step 5.2.3.3.5.1

Multiply $4$ by $3$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3} + 12 \sqrt[3]{x^{2}} + 3 (- 4 \sqrt[3]{x}) + 3 \cdot 1 + 3 (2 \sqrt[3]{x} - 1) + 1}{8}$

Step 5.2.3.3.5.2

Multiply $- 4$ by $3$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3} + 12 \sqrt[3]{x^{2}} - 12 \sqrt[3]{x} + 3 \cdot 1 + 3 (2 \sqrt[3]{x} - 1) + 1}{8}$

Step 5.2.3.3.5.3

Multiply $3$ by $1$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3} + 12 \sqrt[3]{x^{2}} - 12 \sqrt[3]{x} + 3 + 3 (2 \sqrt[3]{x} - 1) + 1}{8}$

Step 5.2.3.3.6

Apply the distributive property.

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3} + 12 \sqrt[3]{x^{2}} - 12 \sqrt[3]{x} + 3 + 3 (2 \sqrt[3]{x}) + 3 \cdot - 1 + 1}{8}$

Step 5.2.3.3.7

Multiply $2$ by $3$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3} + 12 \sqrt[3]{x^{2}} - 12 \sqrt[3]{x} + 3 + 6 \sqrt[3]{x} + 3 \cdot - 1 + 1}{8}$

Step 5.2.3.3.8

Multiply $3$ by $- 1$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3} + 12 \sqrt[3]{x^{2}} - 12 \sqrt[3]{x} + 3 + 6 \sqrt[3]{x} - 3 + 1}{8}$

Step 5.2.3.4

Simplify by adding terms.

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Step 5.2.3.4.1

Combine the opposite terms in ${(2 \sqrt[3]{x} - 1)}^{3} + 12 \sqrt[3]{x^{2}} - 12 \sqrt[3]{x} + 3 + 6 \sqrt[3]{x} - 3 + 1$ .

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Step 5.2.3.4.1.1

Subtract $3$ from $3$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3} + 12 \sqrt[3]{x^{2}} - 12 \sqrt[3]{x} + 0 + 6 \sqrt[3]{x} + 1}{8}$

Step 5.2.3.4.1.2

Add ${(2 \sqrt[3]{x} - 1)}^{3} + 12 \sqrt[3]{x^{2}} - 12 \sqrt[3]{x}$ and $0$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3} + 12 \sqrt[3]{x^{2}} - 12 \sqrt[3]{x} + 6 \sqrt[3]{x} + 1}{8}$

Step 5.2.3.4.2

Add $- 12 \sqrt[3]{x}$ and $6 \sqrt[3]{x}$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 \sqrt[3]{x} - 1)}^{3} + 12 \sqrt[3]{x^{2}} - 6 \sqrt[3]{x} + 1}{8}$

Step 5.2.4

Simplify the numerator.

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Step 5.2.4.1

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

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 x^{\frac{1}{3}} - 1)}^{3} + 12 \sqrt[3]{x^{2}} - 6 \sqrt[3]{x} + 1}{8}$

Step 5.2.4.2

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[3]{x^{2}}$ as $x^{\frac{2}{3}}$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 x^{\frac{1}{3}} - 1)}^{3} + 12 x^{\frac{2}{3}} - 6 \sqrt[3]{x} + 1}{8}$

Step 5.2.4.3

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

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 x^{\frac{1}{3}} - 1)}^{3} + 12 x^{\frac{2}{3}} - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.4

Use the Binomial Theorem.

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{{(2 x^{\frac{1}{3}})}^{3} + 3 {(2 x^{\frac{1}{3}})}^{2} \cdot - 1 + 3 (2 x^{\frac{1}{3}}) {(- 1)}^{2} + {(- 1)}^{3} + 12 x^{\frac{2}{3}} - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.5

Simplify each term.

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Step 5.2.4.5.1

Apply the product rule to $2 x^{\frac{1}{3}}$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{2^{3} {(x^{\frac{1}{3}})}^{3} + 3 {(2 x^{\frac{1}{3}})}^{2} \cdot - 1 + 3 (2 x^{\frac{1}{3}}) {(- 1)}^{2} + {(- 1)}^{3} + 12 x^{\frac{2}{3}} - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.5.2

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

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 {(x^{\frac{1}{3}})}^{3} + 3 {(2 x^{\frac{1}{3}})}^{2} \cdot - 1 + 3 (2 x^{\frac{1}{3}}) {(- 1)}^{2} + {(- 1)}^{3} + 12 x^{\frac{2}{3}} - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.5.3

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

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Step 5.2.4.5.3.1

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

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x^{\frac{1}{3} \cdot 3} + 3 {(2 x^{\frac{1}{3}})}^{2} \cdot - 1 + 3 (2 x^{\frac{1}{3}}) {(- 1)}^{2} + {(- 1)}^{3} + 12 x^{\frac{2}{3}} - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.5.3.2

Cancel the common factor of $3$ .

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Step 5.2.4.5.3.2.1

Cancel the common factor.

Step 5.2.4.5.3.2.2

Rewrite the expression.

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x + 3 {(2 x^{\frac{1}{3}})}^{2} \cdot - 1 + 3 (2 x^{\frac{1}{3}}) {(- 1)}^{2} + {(- 1)}^{3} + 12 x^{\frac{2}{3}} - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.5.4

Simplify.

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x + 3 {(2 x^{\frac{1}{3}})}^{2} \cdot - 1 + 3 (2 x^{\frac{1}{3}}) {(- 1)}^{2} + {(- 1)}^{3} + 12 x^{\frac{2}{3}} - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.5.5

Apply the product rule to $2 x^{\frac{1}{3}}$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x + 3 (2^{2} {(x^{\frac{1}{3}})}^{2}) \cdot - 1 + 3 (2 x^{\frac{1}{3}}) {(- 1)}^{2} + {(- 1)}^{3} + 12 x^{\frac{2}{3}} - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.5.6

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

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x + 3 (4 {(x^{\frac{1}{3}})}^{2}) \cdot - 1 + 3 (2 x^{\frac{1}{3}}) {(- 1)}^{2} + {(- 1)}^{3} + 12 x^{\frac{2}{3}} - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.5.7

Multiply the exponents in ${(x^{\frac{1}{3}})}^{2}$ .

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Step 5.2.4.5.7.1

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

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x + 3 (4 x^{\frac{1}{3} \cdot 2}) \cdot - 1 + 3 (2 x^{\frac{1}{3}}) {(- 1)}^{2} + {(- 1)}^{3} + 12 x^{\frac{2}{3}} - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.5.7.2

Combine $\frac{1}{3}$ and $2$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x + 3 (4 x^{\frac{2}{3}}) \cdot - 1 + 3 (2 x^{\frac{1}{3}}) {(- 1)}^{2} + {(- 1)}^{3} + 12 x^{\frac{2}{3}} - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.5.8

Multiply $4$ by $3$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x + 12 x^{\frac{2}{3}} \cdot - 1 + 3 (2 x^{\frac{1}{3}}) {(- 1)}^{2} + {(- 1)}^{3} + 12 x^{\frac{2}{3}} - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.5.9

Multiply $- 1$ by $12$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x - 12 x^{\frac{2}{3}} + 3 (2 x^{\frac{1}{3}}) {(- 1)}^{2} + {(- 1)}^{3} + 12 x^{\frac{2}{3}} - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.5.10

Multiply $2$ by $3$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x - 12 x^{\frac{2}{3}} + 6 x^{\frac{1}{3}} {(- 1)}^{2} + {(- 1)}^{3} + 12 x^{\frac{2}{3}} - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.5.11

Raise $- 1$ to the power of $2$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x - 12 x^{\frac{2}{3}} + 6 x^{\frac{1}{3}} \cdot 1 + {(- 1)}^{3} + 12 x^{\frac{2}{3}} - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.5.12

Multiply $6$ by $1$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x - 12 x^{\frac{2}{3}} + 6 x^{\frac{1}{3}} + {(- 1)}^{3} + 12 x^{\frac{2}{3}} - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.5.13

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

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x - 12 x^{\frac{2}{3}} + 6 x^{\frac{1}{3}} - 1 + 12 x^{\frac{2}{3}} - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.6

Add $- 12 x^{\frac{2}{3}}$ and $12 x^{\frac{2}{3}}$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x + 6 x^{\frac{1}{3}} - 1 + 0 - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.7

Add $8 x$ and $0$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x + 6 x^{\frac{1}{3}} - 1 - 6 x^{\frac{1}{3}} + 1}{8}$

Step 5.2.4.8

Subtract $6 x^{\frac{1}{3}}$ from $6 x^{\frac{1}{3}}$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x + 0 - 1 + 1}{8}$

Step 5.2.4.9

Add $8 x$ and $0$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x - 1 + 1}{8}$

Step 5.2.4.10

Add $- 1$ and $1$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x + 0}{8}$

Step 5.2.4.11

Add $8 x$ and $0$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x}{8}$

Step 5.2.5

Cancel the common factor of $8$ .

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Step 5.2.5.1

Cancel the common factor.

$f^{- 1} (10 \sqrt[3]{x} - 5) = \frac{8 x}{8}$

Step 5.2.5.2

Divide $x$ by $1$ .

$f^{- 1} (10 \sqrt[3]{x} - 5) = x$

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 $f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8})$ by substituting in the value of $f^{- 1}$ into $f$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}} - 5$

Step 5.3.3

Remove parentheses.

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}} - 5$

Step 5.3.4

Simplify each term.

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Step 5.3.4.1

To write $\frac{3 x^{2}}{200}$ as a fraction with a common denominator, multiply by $\frac{5}{5}$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} \cdot \frac{5}{5} + \frac{3 x}{40} + \frac{1}{8}} - 5$

Step 5.3.4.2

Write each expression with a common denominator of $1000$ , by multiplying each by an appropriate factor of $1$ .

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Step 5.3.4.2.1

Multiply $\frac{3 x^{2}}{200}$ by $\frac{5}{5}$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{3}}{1000} + \frac{3 x^{2} \cdot 5}{200 \cdot 5} + \frac{3 x}{40} + \frac{1}{8}} - 5$

Step 5.3.4.2.2

Multiply $200$ by $5$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{3}}{1000} + \frac{3 x^{2} \cdot 5}{1000} + \frac{3 x}{40} + \frac{1}{8}} - 5$

Step 5.3.4.3

Combine the numerators over the common denominator.

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{3} + 3 x^{2} \cdot 5}{1000} + \frac{3 x}{40} + \frac{1}{8}} - 5$

Step 5.3.4.4

Simplify the numerator.

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Step 5.3.4.4.1

Factor $x^{2}$ out of $x^{3} + 3 x^{2} \cdot 5$ .

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Step 5.3.4.4.1.1

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

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{2} x + 3 x^{2} \cdot 5}{1000} + \frac{3 x}{40} + \frac{1}{8}} - 5$

Step 5.3.4.4.1.2

Factor $x^{2}$ out of $3 x^{2} \cdot 5$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{2} x + x^{2} (3 \cdot 5)}{1000} + \frac{3 x}{40} + \frac{1}{8}} - 5$

Step 5.3.4.4.1.3

Factor $x^{2}$ out of $x^{2} x + x^{2} (3 \cdot 5)$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{2} (x + 3 \cdot 5)}{1000} + \frac{3 x}{40} + \frac{1}{8}} - 5$

Step 5.3.4.4.2

Multiply $3$ by $5$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{2} (x + 15)}{1000} + \frac{3 x}{40} + \frac{1}{8}} - 5$

Step 5.3.4.5

To write $\frac{3 x}{40}$ as a fraction with a common denominator, multiply by $\frac{25}{25}$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{2} (x + 15)}{1000} + \frac{3 x}{40} \cdot \frac{25}{25} + \frac{1}{8}} - 5$

Step 5.3.4.6

Write each expression with a common denominator of $1000$ , by multiplying each by an appropriate factor of $1$ .

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Step 5.3.4.6.1

Multiply $\frac{3 x}{40}$ by $\frac{25}{25}$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{2} (x + 15)}{1000} + \frac{3 x \cdot 25}{40 \cdot 25} + \frac{1}{8}} - 5$

Step 5.3.4.6.2

Multiply $40$ by $25$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{2} (x + 15)}{1000} + \frac{3 x \cdot 25}{1000} + \frac{1}{8}} - 5$

Step 5.3.4.7

Combine the numerators over the common denominator.

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{2} (x + 15) + 3 x \cdot 25}{1000} + \frac{1}{8}} - 5$

Step 5.3.4.8

Simplify the numerator.

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Step 5.3.4.8.1

Factor $x$ out of $x^{2} (x + 15) + 3 x \cdot 25$ .

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Step 5.3.4.8.1.1

Factor $x$ out of $x^{2} (x + 15)$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x (x (x + 15)) + 3 x \cdot 25}{1000} + \frac{1}{8}} - 5$

Step 5.3.4.8.1.2

Factor $x$ out of $3 x \cdot 25$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x (x (x + 15)) + x (3 \cdot 25)}{1000} + \frac{1}{8}} - 5$

Step 5.3.4.8.1.3

Factor $x$ out of $x (x (x + 15)) + x (3 \cdot 25)$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x (x (x + 15) + 3 \cdot 25)}{1000} + \frac{1}{8}} - 5$

Step 5.3.4.8.2

Apply the distributive property.

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x (x \cdot x + x \cdot 15 + 3 \cdot 25)}{1000} + \frac{1}{8}} - 5$

Step 5.3.4.8.3

Multiply $x$ by $x$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x (x^{2} + x \cdot 15 + 3 \cdot 25)}{1000} + \frac{1}{8}} - 5$

Step 5.3.4.8.4

Move $15$ to the left of $x$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x (x^{2} + 15 \cdot x + 3 \cdot 25)}{1000} + \frac{1}{8}} - 5$

Step 5.3.4.8.5

Multiply $3$ by $25$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x (x^{2} + 15 x + 75)}{1000} + \frac{1}{8}} - 5$

Step 5.3.4.9

To write $\frac{1}{8}$ as a fraction with a common denominator, multiply by $\frac{125}{125}$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x (x^{2} + 15 x + 75)}{1000} + \frac{1}{8} \cdot \frac{125}{125}} - 5$

Step 5.3.4.10

Write each expression with a common denominator of $1000$ , by multiplying each by an appropriate factor of $1$ .

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Step 5.3.4.10.1

Multiply $\frac{1}{8}$ by $\frac{125}{125}$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x (x^{2} + 15 x + 75)}{1000} + \frac{125}{8 \cdot 125}} - 5$

Step 5.3.4.10.2

Multiply $8$ by $125$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x (x^{2} + 15 x + 75)}{1000} + \frac{125}{1000}} - 5$

Step 5.3.4.11

Combine the numerators over the common denominator.

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x (x^{2} + 15 x + 75) + 125}{1000}} - 5$

Step 5.3.4.12

Simplify the numerator.

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Step 5.3.4.12.1

Apply the distributive property.

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x \cdot x^{2} + x (15 x) + x \cdot 75 + 125}{1000}} - 5$

Step 5.3.4.12.2

Simplify.

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Step 5.3.4.12.2.1

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

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Step 5.3.4.12.2.1.1

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

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Step 5.3.4.12.2.1.1.1

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

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x \cdot x^{2} + x (15 x) + x \cdot 75 + 125}{1000}} - 5$

Step 5.3.4.12.2.1.1.2

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

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{1 + 2} + x (15 x) + x \cdot 75 + 125}{1000}} - 5$

Step 5.3.4.12.2.1.2

Add $1$ and $2$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{3} + x (15 x) + x \cdot 75 + 125}{1000}} - 5$

Step 5.3.4.12.2.2

Rewrite using the commutative property of multiplication.

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{3} + 15 x \cdot x + x \cdot 75 + 125}{1000}} - 5$

Step 5.3.4.12.2.3

Move $75$ to the left of $x$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{3} + 15 x \cdot x + 75 \cdot x + 125}{1000}} - 5$

Step 5.3.4.12.3

Multiply $x$ by $x$ by adding the exponents.

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Step 5.3.4.12.3.1

Move $x$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{3} + 15 (x \cdot x) + 75 \cdot x + 125}{1000}} - 5$

Step 5.3.4.12.3.2

Multiply $x$ by $x$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{3} + 15 x^{2} + 75 \cdot x + 125}{1000}} - 5$

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{3} + 15 x^{2} + 75 x + 125}{1000}} - 5$

Step 5.3.4.12.4

Rewrite $x^{3} + 15 x^{2} + 75 x + 125$ in a factored form.

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Step 5.3.4.12.4.1

Regroup terms.

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{3} + 125 + 15 x^{2} + 75 x}{1000}} - 5$

Step 5.3.4.12.4.2

Rewrite $125$ as $5^{3}$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{x^{3} + 5^{3} + 15 x^{2} + 75 x}{1000}} - 5$

Step 5.3.4.12.4.3

Since both terms are perfect cubes, factor using the sum of cubes formula, $a^{3} + b^{3} = (a + b) (a^{2} - a b + b^{2})$ where $a = x$ and $b = 5$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{(x + 5) (x^{2} - x \cdot 5 + 5^{2}) + 15 x^{2} + 75 x}{1000}} - 5$

Step 5.3.4.12.4.4

Simplify.

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Step 5.3.4.12.4.4.1

Multiply $5$ by $- 1$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{(x + 5) (x^{2} - 5 x + 5^{2}) + 15 x^{2} + 75 x}{1000}} - 5$

Step 5.3.4.12.4.4.2

Raise $5$ to the power of $2$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{(x + 5) (x^{2} - 5 x + 25) + 15 x^{2} + 75 x}{1000}} - 5$

Step 5.3.4.12.4.5

Factor $15 x$ out of $15 x^{2} + 75 x$ .

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Step 5.3.4.12.4.5.1

Factor $15 x$ out of $15 x^{2}$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{(x + 5) (x^{2} - 5 x + 25) + 15 x (x) + 75 x}{1000}} - 5$

Step 5.3.4.12.4.5.2

Factor $15 x$ out of $75 x$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{(x + 5) (x^{2} - 5 x + 25) + 15 x (x) + 15 x (5)}{1000}} - 5$

Step 5.3.4.12.4.5.3

Factor $15 x$ out of $15 x (x) + 15 x (5)$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{(x + 5) (x^{2} - 5 x + 25) + 15 x (x + 5)}{1000}} - 5$

Step 5.3.4.12.4.6

Factor $x + 5$ out of $(x + 5) (x^{2} - 5 x + 25) + 15 x (x + 5)$ .

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Step 5.3.4.12.4.6.1

Factor $x + 5$ out of $15 x (x + 5)$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{(x + 5) (x^{2} - 5 x + 25) + (x + 5) (15 x)}{1000}} - 5$

Step 5.3.4.12.4.6.2

Factor $x + 5$ out of $(x + 5) (x^{2} - 5 x + 25) + (x + 5) (15 x)$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{(x + 5) (x^{2} - 5 x + 25 + 15 x)}{1000}} - 5$

Step 5.3.4.12.4.7

Add $- 5 x$ and $15 x$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{(x + 5) (x^{2} + 10 x + 25)}{1000}} - 5$

Step 5.3.4.12.4.8

Factor using the perfect square rule.

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Step 5.3.4.12.4.8.1

Rewrite $25$ as $5^{2}$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{(x + 5) (x^{2} + 10 x + 5^{2})}{1000}} - 5$

Step 5.3.4.12.4.8.2

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

$10 x = 2 \cdot x \cdot 5$

Step 5.3.4.12.4.8.3

Rewrite the polynomial.

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{(x + 5) (x^{2} + 2 \cdot x \cdot 5 + 5^{2})}{1000}} - 5$

Step 5.3.4.12.4.8.4

Factor using the perfect square trinomial rule $a^{2} + 2 a b + b^{2} = {(a + b)}^{2}$ , where $a = x$ and $b = 5$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{(x + 5) {(x + 5)}^{2}}{1000}} - 5$

Step 5.3.4.13

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

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Step 5.3.4.13.1

Multiply $x + 5$ by ${(x + 5)}^{2}$ .

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Step 5.3.4.13.1.1

Raise $x + 5$ to the power of $1$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{(x + 5) {(x + 5)}^{2}}{1000}} - 5$

Step 5.3.4.13.1.2

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

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{{(x + 5)}^{1 + 2}}{1000}} - 5$

Step 5.3.4.13.2

Add $1$ and $2$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{{(x + 5)}^{3}}{1000}} - 5$

Step 5.3.4.14

Rewrite $1000$ as $10^{3}$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{\frac{{(x + 5)}^{3}}{10^{3}}} - 5$

Step 5.3.4.15

Rewrite $\frac{{(x + 5)}^{3}}{10^{3}}$ as ${(\frac{x + 5}{10})}^{3}$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 \sqrt[3]{{(\frac{x + 5}{10})}^{3}} - 5$

Step 5.3.4.16

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

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 (\frac{x + 5}{10}) - 5$

Step 5.3.4.17

Cancel the common factor of $10$ .

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Step 5.3.4.17.1

Cancel the common factor.

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = 10 (\frac{x + 5}{10}) - 5$

Step 5.3.4.17.2

Rewrite the expression.

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = x + 5 - 5$

Step 5.3.5

Combine the opposite terms in $x + 5 - 5$ .

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Step 5.3.5.1

Subtract $5$ from $5$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = x + 0$

Step 5.3.5.2

Add $x$ and $0$ .

$f (\frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}) = x$

Step 5.4

Since $f^{- 1} (f (x)) = x$ and $f (f^{- 1} (x)) = x$ , then $f^{- 1} (x) = \frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}$ is the inverse of $f (x) = 10 \sqrt[3]{x} - 5$ .

$f^{- 1} (x) = \frac{x^{3}}{1000} + \frac{3 x^{2}}{200} + \frac{3 x}{40} + \frac{1}{8}$