Precalculus Examples

$f (x) = \sqrt[3]{x} + 4$

Step 1

Set $\sqrt[3]{x} + 4$ equal to $0$ .

$\sqrt[3]{x} + 4 = 0$

Step 2

Solve for $x$ .

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Step 2.1

Subtract $4$ from both sides of the equation.

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

Step 2.2

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

${\sqrt[3]{x}}^{3} = {(- 4)}^{3}$

Step 2.3

Simplify each side of the equation.

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Step 2.3.1

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

${(x^{\frac{1}{3}})}^{3} = {(- 4)}^{3}$

Step 2.3.2

Simplify the left side.

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Step 2.3.2.1

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

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Step 2.3.2.1.1

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

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Step 2.3.2.1.1.1

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

$x^{\frac{1}{3} \cdot 3} = {(- 4)}^{3}$

Step 2.3.2.1.1.2

Cancel the common factor of $3$ .

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Step 2.3.2.1.1.2.1

Cancel the common factor.

$x^{\frac{1}{3} \cdot 3} = {(- 4)}^{3}$

Step 2.3.2.1.1.2.2

Rewrite the expression.

$x^{1} = {(- 4)}^{3}$

Step 2.3.2.1.2

Simplify.

$x = {(- 4)}^{3}$

Step 2.3.3

Simplify the right side.

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Step 2.3.3.1

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

$x = - 64$

Step 3