Calculus Examples

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

Step 1

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

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

Step 2

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

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Step 2.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{x}$ as $x^{\frac{1}{2}}$ .

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

Step 2.2

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

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

Step 2.3

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

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

Step 2.4

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

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

Step 2.5

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

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

Step 2.6

Combine the numerators over the common denominator.

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

Step 2.7

Simplify the numerator.

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Step 2.7.1

Multiply $- 1$ by $2$ .

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

Step 2.7.2

Subtract $2$ from $1$ .

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

Step 2.8

Move the negative in front of the fraction.

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

Step 2.9

Combine $\frac{1}{2}$ and $x^{- \frac{1}{2}}$ .

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

Step 2.10

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

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

Step 2.11

Multiply $2$ by $2$ .

$\frac{3 x^{- \frac{1}{2}}}{4} + \frac{d}{d x} [- 2 \sqrt{x^{3}}]$

Step 2.12

Move $x^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{3}{4 x^{\frac{1}{2}}} + \frac{d}{d x} [- 2 \sqrt{x^{3}}]$

Step 3

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

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Step 3.1

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

$\frac{3}{4 x^{\frac{1}{2}}} + \frac{d}{d x} [- 2 x^{\frac{3}{2}}]$

Step 3.2

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

$\frac{3}{4 x^{\frac{1}{2}}} - 2 \frac{d}{d x} [x^{\frac{3}{2}}]$

Step 3.3

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

$\frac{3}{4 x^{\frac{1}{2}}} - 2 (\frac{3}{2} x^{\frac{3}{2} - 1})$

Step 3.4

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$\frac{3}{4 x^{\frac{1}{2}}} - 2 (\frac{3}{2} x^{\frac{3}{2} - 1 \cdot \frac{2}{2}})$

Step 3.5

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

$\frac{3}{4 x^{\frac{1}{2}}} - 2 (\frac{3}{2} x^{\frac{3}{2} + \frac{- 1 \cdot 2}{2}})$

Step 3.6

Combine the numerators over the common denominator.

$\frac{3}{4 x^{\frac{1}{2}}} - 2 (\frac{3}{2} x^{\frac{3 - 1 \cdot 2}{2}})$

Step 3.7

Simplify the numerator.

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Step 3.7.1

Multiply $- 1$ by $2$ .

$\frac{3}{4 x^{\frac{1}{2}}} - 2 (\frac{3}{2} x^{\frac{3 - 2}{2}})$

Step 3.7.2

Subtract $2$ from $3$ .

$\frac{3}{4 x^{\frac{1}{2}}} - 2 (\frac{3}{2} x^{\frac{1}{2}})$

Step 3.8

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

$\frac{3}{4 x^{\frac{1}{2}}} - 2 \frac{3 x^{\frac{1}{2}}}{2}$

Step 3.9

Combine $- 2$ and $\frac{3 x^{\frac{1}{2}}}{2}$ .

$\frac{3}{4 x^{\frac{1}{2}}} + \frac{- 2 (3 x^{\frac{1}{2}})}{2}$

Step 3.10

Multiply $3$ by $- 2$ .

$\frac{3}{4 x^{\frac{1}{2}}} + \frac{- 6 x^{\frac{1}{2}}}{2}$

Step 3.11

Factor $2$ out of $- 6 x^{\frac{1}{2}}$ .

$\frac{3}{4 x^{\frac{1}{2}}} + \frac{2 (- 3 x^{\frac{1}{2}})}{2}$

Step 3.12

Cancel the common factors.

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Step 3.12.1

Factor $2$ out of $2$ .

$\frac{3}{4 x^{\frac{1}{2}}} + \frac{2 (- 3 x^{\frac{1}{2}})}{2 (1)}$

Step 3.12.2

Cancel the common factor.

$\frac{3}{4 x^{\frac{1}{2}}} + \frac{2 (- 3 x^{\frac{1}{2}})}{2 \cdot 1}$

Step 3.12.3

Rewrite the expression.

$\frac{3}{4 x^{\frac{1}{2}}} + \frac{- 3 x^{\frac{1}{2}}}{1}$

Step 3.12.4

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

$\frac{3}{4 x^{\frac{1}{2}}} - 3 x^{\frac{1}{2}}$

Step 4

Reorder terms.

$- 3 x^{\frac{1}{2}} + \frac{3}{4 x^{\frac{1}{2}}}$