Calculus Examples

$x^{\frac{1}{3}} - x^{- \frac{2}{3}}$

Step 1

Find the first derivative.

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Step 1.1

Find the first derivative.

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Step 1.1.1

By the Sum Rule, the derivative of $x^{\frac{1}{3}} - x^{- \frac{2}{3}}$ with respect to $x$ is $\frac{d}{d x} [x^{\frac{1}{3}}] + \frac{d}{d x} [- x^{- \frac{2}{3}}]$ .

$\frac{d}{d x} [x^{\frac{1}{3}}] + \frac{d}{d x} [- x^{- \frac{2}{3}}]$

Step 1.1.2

Evaluate $\frac{d}{d x} [x^{\frac{1}{3}}]$ .

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Step 1.1.2.1

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = \frac{1}{3}$ .

$\frac{1}{3} x^{\frac{1}{3} - 1} + \frac{d}{d x} [- x^{- \frac{2}{3}}]$

Step 1.1.2.2

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$\frac{1}{3} x^{\frac{1}{3} - 1 \cdot \frac{3}{3}} + \frac{d}{d x} [- x^{- \frac{2}{3}}]$

Step 1.1.2.3

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

$\frac{1}{3} x^{\frac{1}{3} + \frac{- 1 \cdot 3}{3}} + \frac{d}{d x} [- x^{- \frac{2}{3}}]$

Step 1.1.2.4

Combine the numerators over the common denominator.

$\frac{1}{3} x^{\frac{1 - 1 \cdot 3}{3}} + \frac{d}{d x} [- x^{- \frac{2}{3}}]$

Step 1.1.2.5

Simplify the numerator.

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Step 1.1.2.5.1

Multiply $- 1$ by $3$ .

$\frac{1}{3} x^{\frac{1 - 3}{3}} + \frac{d}{d x} [- x^{- \frac{2}{3}}]$

Step 1.1.2.5.2

Subtract $3$ from $1$ .

$\frac{1}{3} x^{\frac{- 2}{3}} + \frac{d}{d x} [- x^{- \frac{2}{3}}]$

Step 1.1.2.6

Move the negative in front of the fraction.

$\frac{1}{3} x^{- \frac{2}{3}} + \frac{d}{d x} [- x^{- \frac{2}{3}}]$

Step 1.1.3

Evaluate $\frac{d}{d x} [- x^{- \frac{2}{3}}]$ .

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Step 1.1.3.1

Since $- 1$ is constant with respect to $x$ , the derivative of $- x^{- \frac{2}{3}}$ with respect to $x$ is $- \frac{d}{d x} [x^{- \frac{2}{3}}]$ .

$\frac{1}{3} x^{- \frac{2}{3}} - \frac{d}{d x} [x^{- \frac{2}{3}}]$

Step 1.1.3.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = - \frac{2}{3}$ .

$\frac{1}{3} x^{- \frac{2}{3}} - (- \frac{2}{3} x^{- \frac{2}{3} - 1})$

Step 1.1.3.3

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$\frac{1}{3} x^{- \frac{2}{3}} - (- \frac{2}{3} x^{- \frac{2}{3} - 1 \cdot \frac{3}{3}})$

Step 1.1.3.4

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

$\frac{1}{3} x^{- \frac{2}{3}} - (- \frac{2}{3} x^{- \frac{2}{3} + \frac{- 1 \cdot 3}{3}})$

Step 1.1.3.5

Combine the numerators over the common denominator.

$\frac{1}{3} x^{- \frac{2}{3}} - (- \frac{2}{3} x^{\frac{- 2 - 1 \cdot 3}{3}})$

Step 1.1.3.6

Simplify the numerator.

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Step 1.1.3.6.1

Multiply $- 1$ by $3$ .

$\frac{1}{3} x^{- \frac{2}{3}} - (- \frac{2}{3} x^{\frac{- 2 - 3}{3}})$

Step 1.1.3.6.2

Subtract $3$ from $- 2$ .

$\frac{1}{3} x^{- \frac{2}{3}} - (- \frac{2}{3} x^{\frac{- 5}{3}})$

Step 1.1.3.7

Move the negative in front of the fraction.

$\frac{1}{3} x^{- \frac{2}{3}} - (- \frac{2}{3} x^{- \frac{5}{3}})$

Step 1.1.3.8

Combine $x^{- \frac{5}{3}}$ and $\frac{2}{3}$ .

$\frac{1}{3} x^{- \frac{2}{3}} - - \frac{x^{- \frac{5}{3}} \cdot 2}{3}$

Step 1.1.3.9

Multiply $- 1$ by $- 1$ .

$\frac{1}{3} x^{- \frac{2}{3}} + 1 \frac{x^{- \frac{5}{3}} \cdot 2}{3}$

Step 1.1.3.10

Multiply $\frac{x^{- \frac{5}{3}} \cdot 2}{3}$ by $1$ .

$\frac{1}{3} x^{- \frac{2}{3}} + \frac{x^{- \frac{5}{3}} \cdot 2}{3}$

Step 1.1.3.11

Move $2$ to the left of $x^{- \frac{5}{3}}$ .

$\frac{1}{3} x^{- \frac{2}{3}} + \frac{2 \cdot x^{- \frac{5}{3}}}{3}$

Step 1.1.3.12

Move $x^{- \frac{5}{3}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{1}{3} x^{- \frac{2}{3}} + \frac{2}{3 x^{\frac{5}{3}}}$

Step 1.1.4

Simplify.

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Step 1.1.4.1

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{1}{3} \cdot \frac{1}{x^{\frac{2}{3}}} + \frac{2}{3 x^{\frac{5}{3}}}$

Step 1.1.4.2

Multiply $\frac{1}{3}$ by $\frac{1}{x^{\frac{2}{3}}}$ .

$f' (x) = \frac{1}{3 x^{\frac{2}{3}}} + \frac{2}{3 x^{\frac{5}{3}}}$

Step 1.2

The first derivative of $f (x)$ with respect to $x$ is $\frac{1}{3 x^{\frac{2}{3}}} + \frac{2}{3 x^{\frac{5}{3}}}$ .

$\frac{1}{3 x^{\frac{2}{3}}} + \frac{2}{3 x^{\frac{5}{3}}}$

Step 2

Set the first derivative equal to $0$ then solve the equation $\frac{1}{3 x^{\frac{2}{3}}} + \frac{2}{3 x^{\frac{5}{3}}} = 0$ .

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Step 2.1

Set the first derivative equal to $0$ .

$\frac{1}{3 x^{\frac{2}{3}}} + \frac{2}{3 x^{\frac{5}{3}}} = 0$

Step 2.2

Find the LCD of the terms in the equation.

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Step 2.2.1

Finding the LCD of a list of values is the same as finding the LCM of the denominators of those values.

$3 x^{\frac{2}{3}}, 3 x^{\frac{5}{3}}, 1$

Step 2.2.2

Since $3 x^{\frac{2}{3}}, 3 x^{\frac{5}{3}}, 1$ contains both numbers and variables, there are two steps to find the LCM. Find LCM for the numeric part $3, 3, 1$ then find LCM for the variable part $x^{\frac{2}{3}}, x^{\frac{5}{3}}$ .

Step 2.2.3

The LCM is the smallest positive number that all of the numbers divide into evenly.

1. List the prime factors of each number.

2. Multiply each factor the greatest number of times it occurs in either number.

Step 2.2.4

Since $3$ has no factors besides $1$ and $3$ .

$3$ is a prime number

Step 2.2.5

The number $1$ is not a prime number because it only has one positive factor, which is itself.

Not prime

Step 2.2.6

The LCM of $3, 3, 1$ is the result of multiplying all prime factors the greatest number of times they occur in either number.

$3$

Step 2.2.7

The LCM of $x^{\frac{2}{3}}, x^{\frac{5}{3}}$ is the result of multiplying all prime factors the greatest number of times they occur in either term.

$x^{\frac{5}{3}}$

Step 2.2.8

The LCM for $3 x^{\frac{2}{3}}, 3 x^{\frac{5}{3}}, 1$ is the numeric part $3$ multiplied by the variable part.

$3 x^{\frac{5}{3}}$

Step 2.3

Multiply each term in $\frac{1}{3 x^{\frac{2}{3}}} + \frac{2}{3 x^{\frac{5}{3}}} = 0$ by $3 x^{\frac{5}{3}}$ to eliminate the fractions.

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Step 2.3.1

Multiply each term in $\frac{1}{3 x^{\frac{2}{3}}} + \frac{2}{3 x^{\frac{5}{3}}} = 0$ by $3 x^{\frac{5}{3}}$ .

$\frac{1}{3 x^{\frac{2}{3}}} (3 x^{\frac{5}{3}}) + \frac{2}{3 x^{\frac{5}{3}}} (3 x^{\frac{5}{3}}) = 0 (3 x^{\frac{5}{3}})$

Step 2.3.2

Simplify the left side.

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Step 2.3.2.1

Simplify each term.

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Step 2.3.2.1.1

Rewrite using the commutative property of multiplication.

$3 \frac{1}{3 x^{\frac{2}{3}}} x^{\frac{5}{3}} + \frac{2}{3 x^{\frac{5}{3}}} (3 x^{\frac{5}{3}}) = 0 (3 x^{\frac{5}{3}})$

Step 2.3.2.1.2

Cancel the common factor of $3$ .

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Step 2.3.2.1.2.1

Cancel the common factor.

$3 \frac{1}{3 x^{\frac{2}{3}}} x^{\frac{5}{3}} + \frac{2}{3 x^{\frac{5}{3}}} (3 x^{\frac{5}{3}}) = 0 (3 x^{\frac{5}{3}})$

Step 2.3.2.1.2.2

Rewrite the expression.

$\frac{1}{x^{\frac{2}{3}}} x^{\frac{5}{3}} + \frac{2}{3 x^{\frac{5}{3}}} (3 x^{\frac{5}{3}}) = 0 (3 x^{\frac{5}{3}})$

Step 2.3.2.1.3

Cancel the common factor of $x^{\frac{2}{3}}$ .

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Step 2.3.2.1.3.1

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

$\frac{1}{x^{\frac{2}{3}}} (x^{\frac{2}{3}} x^{\frac{3}{3}}) + \frac{2}{3 x^{\frac{5}{3}}} (3 x^{\frac{5}{3}}) = 0 (3 x^{\frac{5}{3}})$

Step 2.3.2.1.3.2

Cancel the common factor.

$\frac{1}{x^{\frac{2}{3}}} (x^{\frac{2}{3}} x^{\frac{3}{3}}) + \frac{2}{3 x^{\frac{5}{3}}} (3 x^{\frac{5}{3}}) = 0 (3 x^{\frac{5}{3}})$

Step 2.3.2.1.3.3

Rewrite the expression.

$x^{\frac{3}{3}} + \frac{2}{3 x^{\frac{5}{3}}} (3 x^{\frac{5}{3}}) = 0 (3 x^{\frac{5}{3}})$

Step 2.3.2.1.4

Divide $3$ by $3$ .

$x^{1} + \frac{2}{3 x^{\frac{5}{3}}} (3 x^{\frac{5}{3}}) = 0 (3 x^{\frac{5}{3}})$

Step 2.3.2.1.5

Simplify.

$x + \frac{2}{3 x^{\frac{5}{3}}} (3 x^{\frac{5}{3}}) = 0 (3 x^{\frac{5}{3}})$

Step 2.3.2.1.6

Rewrite using the commutative property of multiplication.

$x + 3 \frac{2}{3 x^{\frac{5}{3}}} x^{\frac{5}{3}} = 0 (3 x^{\frac{5}{3}})$

Step 2.3.2.1.7

Cancel the common factor of $3$ .

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Step 2.3.2.1.7.1

Cancel the common factor.

$x + 3 \frac{2}{3 x^{\frac{5}{3}}} x^{\frac{5}{3}} = 0 (3 x^{\frac{5}{3}})$

Step 2.3.2.1.7.2

Rewrite the expression.

$x + \frac{2}{x^{\frac{5}{3}}} x^{\frac{5}{3}} = 0 (3 x^{\frac{5}{3}})$

Step 2.3.2.1.8

Cancel the common factor of $x^{\frac{5}{3}}$ .

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Step 2.3.2.1.8.1

Cancel the common factor.

$x + \frac{2}{x^{\frac{5}{3}}} x^{\frac{5}{3}} = 0 (3 x^{\frac{5}{3}})$

Step 2.3.2.1.8.2

Rewrite the expression.

$x + 2 = 0 (3 x^{\frac{5}{3}})$

Step 2.3.3

Simplify the right side.

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Step 2.3.3.1

Multiply $0 (3 x^{\frac{5}{3}})$ .

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Step 2.3.3.1.1

Multiply $3$ by $0$ .

$x + 2 = 0 x^{\frac{5}{3}}$

Step 2.3.3.1.2

Multiply $0$ by $x^{\frac{5}{3}}$ .

$x + 2 = 0$

Step 2.4

Subtract $2$ from both sides of the equation.

$x = - 2$

Step 3

Find the values where the derivative is undefined.

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Step 3.1

Convert expressions with fractional exponents to radicals.

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Step 3.1.1

Apply the rule $x^{\frac{m}{n}} = \sqrt[n]{x^{m}}$ to rewrite the exponentiation as a radical.

$\frac{1}{3 \sqrt[3]{x^{2}}} + \frac{2}{3 x^{\frac{5}{3}}}$

Step 3.1.2

Apply the rule $x^{\frac{m}{n}} = \sqrt[n]{x^{m}}$ to rewrite the exponentiation as a radical.

$\frac{1}{3 \sqrt[3]{x^{2}}} + \frac{2}{3 \sqrt[3]{x^{5}}}$

Step 3.2

Set the denominator in $\frac{1}{3 \sqrt[3]{x^{2}}}$ equal to $0$ to find where the expression is undefined.

$3 \sqrt[3]{x^{2}} = 0$

Step 3.3

Solve for $x$ .

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Step 3.3.1

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

${(3 \sqrt[3]{x^{2}})}^{3} = 0^{3}$

Step 3.3.2

Simplify each side of the equation.

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Step 3.3.2.1

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

${(3 x^{\frac{2}{3}})}^{3} = 0^{3}$

Step 3.3.2.2

Simplify the left side.

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Step 3.3.2.2.1

Simplify ${(3 x^{\frac{2}{3}})}^{3}$ .

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Step 3.3.2.2.1.1

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

$3^{3} {(x^{\frac{2}{3}})}^{3} = 0^{3}$

Step 3.3.2.2.1.2

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

$27 {(x^{\frac{2}{3}})}^{3} = 0^{3}$

Step 3.3.2.2.1.3

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

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Step 3.3.2.2.1.3.1

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

$27 x^{\frac{2}{3} \cdot 3} = 0^{3}$

Step 3.3.2.2.1.3.2

Cancel the common factor of $3$ .

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Step 3.3.2.2.1.3.2.1

Cancel the common factor.

$27 x^{\frac{2}{3} \cdot 3} = 0^{3}$

Step 3.3.2.2.1.3.2.2

Rewrite the expression.

$27 x^{2} = 0^{3}$

Step 3.3.2.3

Simplify the right side.

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Step 3.3.2.3.1

Raising $0$ to any positive power yields $0$ .

$27 x^{2} = 0$

Step 3.3.3

Solve for $x$ .

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Step 3.3.3.1

Divide each term in $27 x^{2} = 0$ by $27$ and simplify.

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Step 3.3.3.1.1

Divide each term in $27 x^{2} = 0$ by $27$ .

$\frac{27 x^{2}}{27} = \frac{0}{27}$

Step 3.3.3.1.2

Simplify the left side.

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Step 3.3.3.1.2.1

Cancel the common factor of $27$ .

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Step 3.3.3.1.2.1.1

Cancel the common factor.

$\frac{27 x^{2}}{27} = \frac{0}{27}$

Step 3.3.3.1.2.1.2

Divide $x^{2}$ by $1$ .

$x^{2} = \frac{0}{27}$

Step 3.3.3.1.3

Simplify the right side.

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Step 3.3.3.1.3.1

Divide $0$ by $27$ .

$x^{2} = 0$

Step 3.3.3.2

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

$x = \pm \sqrt{0}$

Step 3.3.3.3

Simplify $\pm \sqrt{0}$ .

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Step 3.3.3.3.1

Rewrite $0$ as $0^{2}$ .

$x = \pm \sqrt{0^{2}}$

Step 3.3.3.3.2

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

$x = \pm 0$

Step 3.3.3.3.3

Plus or minus $0$ is $0$ .

$x = 0$

Step 3.4

Set the denominator in $\frac{2}{3 \sqrt[3]{x^{5}}}$ equal to $0$ to find where the expression is undefined.

$3 \sqrt[3]{x^{5}} = 0$

Step 3.5

Solve for $x$ .

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Step 3.5.1

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

${(3 \sqrt[3]{x^{5}})}^{3} = 0^{3}$

Step 3.5.2

Simplify each side of the equation.

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Step 3.5.2.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[3]{x^{5}}$ as $x^{\frac{5}{3}}$ .

${(3 x^{\frac{5}{3}})}^{3} = 0^{3}$

Step 3.5.2.2

Simplify the left side.

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Step 3.5.2.2.1

Simplify ${(3 x^{\frac{5}{3}})}^{3}$ .

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Step 3.5.2.2.1.1

Apply the product rule to $3 x^{\frac{5}{3}}$ .

$3^{3} {(x^{\frac{5}{3}})}^{3} = 0^{3}$

Step 3.5.2.2.1.2

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

$27 {(x^{\frac{5}{3}})}^{3} = 0^{3}$

Step 3.5.2.2.1.3

Multiply the exponents in ${(x^{\frac{5}{3}})}^{3}$ .

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Step 3.5.2.2.1.3.1

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

$27 x^{\frac{5}{3} \cdot 3} = 0^{3}$

Step 3.5.2.2.1.3.2

Cancel the common factor of $3$ .

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Step 3.5.2.2.1.3.2.1

Cancel the common factor.

$27 x^{\frac{5}{3} \cdot 3} = 0^{3}$

Step 3.5.2.2.1.3.2.2

Rewrite the expression.

$27 x^{5} = 0^{3}$

Step 3.5.2.3

Simplify the right side.

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Step 3.5.2.3.1

Raising $0$ to any positive power yields $0$ .

$27 x^{5} = 0$

Step 3.5.3

Solve for $x$ .

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Step 3.5.3.1

Divide each term in $27 x^{5} = 0$ by $27$ and simplify.

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Step 3.5.3.1.1

Divide each term in $27 x^{5} = 0$ by $27$ .

$\frac{27 x^{5}}{27} = \frac{0}{27}$

Step 3.5.3.1.2

Simplify the left side.

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Step 3.5.3.1.2.1

Cancel the common factor of $27$ .

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Step 3.5.3.1.2.1.1

Cancel the common factor.

$\frac{27 x^{5}}{27} = \frac{0}{27}$

Step 3.5.3.1.2.1.2

Divide $x^{5}$ by $1$ .

$x^{5} = \frac{0}{27}$

Step 3.5.3.1.3

Simplify the right side.

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Step 3.5.3.1.3.1

Divide $0$ by $27$ .

$x^{5} = 0$

Step 3.5.3.2

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

$x = \sqrt[5]{0}$

Step 3.5.3.3

Simplify $\sqrt[5]{0}$ .

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Step 3.5.3.3.1

Rewrite $0$ as $0^{5}$ .

$x = \sqrt[5]{0^{5}}$

Step 3.5.3.3.2

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

$x = 0$

Step 4

Evaluate $x^{\frac{1}{3}} - x^{- \frac{2}{3}}$ at each $x$ value where the derivative is $0$ or undefined.

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Step 4.1

Evaluate at $x = - 2$ .

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Step 4.1.1

Substitute $- 2$ for $x$ .

${(- 2)}^{\frac{1}{3}} - {(- 2)}^{- \frac{2}{3}}$

Step 4.1.2

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

${(- 2)}^{\frac{1}{3}} - \frac{1}{{(- 2)}^{\frac{2}{3}}}$

Step 4.2

Evaluate at $x = 0$ .

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Step 4.2.1

Substitute $0$ for $x$ .

${(0)}^{\frac{1}{3}} - {(0)}^{- \frac{2}{3}}$

Step 4.2.2

Simplify.

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Step 4.2.2.1

Simplify each term.

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Step 4.2.2.1.1

Rewrite $0$ as $0^{3}$ .

${(0^{3})}^{\frac{1}{3}} - {(0)}^{- \frac{2}{3}}$

Step 4.2.2.1.2

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

$0^{3 (\frac{1}{3})} - {(0)}^{- \frac{2}{3}}$

Step 4.2.2.1.3

Cancel the common factor of $3$ .

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Step 4.2.2.1.3.1

Cancel the common factor.

$0^{3 (\frac{1}{3})} - {(0)}^{- \frac{2}{3}}$

Step 4.2.2.1.3.2

Rewrite the expression.

$0^{1} - {(0)}^{- \frac{2}{3}}$

Step 4.2.2.1.4

Evaluate the exponent.

$0 - {(0)}^{- \frac{2}{3}}$

Step 4.2.2.1.5

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$0 - \frac{1}{0^{\frac{2}{3}}}$

Step 4.2.2.1.6

Simplify the denominator.

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Step 4.2.2.1.6.1

Rewrite $0$ as $0^{3}$ .

$0 - \frac{1}{{(0^{3})}^{\frac{2}{3}}}$

Step 4.2.2.1.6.2

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

$0 - \frac{1}{0^{3 (\frac{2}{3})}}$

Step 4.2.2.1.6.3

Cancel the common factor of $3$ .

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Step 4.2.2.1.6.3.1

Cancel the common factor.

$0 - \frac{1}{0^{3 (\frac{2}{3})}}$

Step 4.2.2.1.6.3.2

Rewrite the expression.

$0 - \frac{1}{0^{2}}$

Step 4.2.2.1.6.4

Raising $0$ to any positive power yields $0$ .

$0 - \frac{1}{0}$

Step 4.2.2.1.6.5

The expression contains a division by $0$ . The expression is undefined.

Undefined

$0 - \frac{1}{0}$

Step 4.2.2.1.7

The expression contains a division by $0$ . The expression is undefined.

Undefined

$0 - \frac{1}{0}$

Step 4.2.2.2

The expression contains a division by $0$ . The expression is undefined.

Undefined

Step 4.3

List all of the points.

$(- 2, {(- 2)}^{\frac{1}{3}} - \frac{1}{{(- 2)}^{\frac{2}{3}}})$

Step 5