Calculus Examples

$y = \frac{3 x^{3} + 2 x^{2}}{\sqrt{x}}$

Step 1

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

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

Step 2

Differentiate both sides of the equation.

$\frac{d}{d x} (y) = \frac{d}{d x} (\frac{3 x^{3} + 2 x^{2}}{x^{\frac{1}{2}}})$

Step 3

The derivative of $y$ with respect to $x$ is $y'$ .

$y'$

Step 4

Differentiate the right side of the equation.

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Step 4.1

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

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Step 4.1.1

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

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

Step 4.1.2

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

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

Step 4.1.3

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

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

Step 4.2

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

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

Step 4.3

Multiply $x^{2}$ by $x^{- \frac{1}{2}}$ by adding the exponents.

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Step 4.3.1

Move $x^{- \frac{1}{2}}$ .

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

Step 4.3.2

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

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

Step 4.3.3

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

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

Step 4.3.4

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

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

Step 4.3.5

Combine the numerators over the common denominator.

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

Step 4.3.6

Simplify the numerator.

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Step 4.3.6.1

Multiply $2$ by $2$ .

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

Step 4.3.6.2

Add $- 1$ and $4$ .

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

Step 4.4

Differentiate using the Product Rule which states that $\frac{d}{d x} [f (x) g (x)]$ is $f (x) \frac{d}{d x} [g (x)] + g (x) \frac{d}{d x} [f (x)]$ where $f (x) = x^{\frac{3}{2}}$ and $g (x) = 3 x + 2$ .

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

Step 4.5

Differentiate.

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Step 4.5.1

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

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

Step 4.5.2

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

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

Step 4.5.3

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

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

Step 4.5.4

Multiply $3$ by $1$ .

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

Step 4.5.5

Since $2$ is constant with respect to $x$ , the derivative of $2$ with respect to $x$ is $0$ .

$x^{\frac{3}{2}} (3 + 0) + (3 x + 2) \frac{d}{d x} [x^{\frac{3}{2}}]$

Step 4.5.6

Simplify the expression.

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Step 4.5.6.1

Add $3$ and $0$ .

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

Step 4.5.6.2

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

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

Step 4.5.7

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

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

Step 4.6

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

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

Step 4.7

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

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

Step 4.8

Combine the numerators over the common denominator.

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

Step 4.9

Simplify the numerator.

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Step 4.9.1

Multiply $- 1$ by $2$ .

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

Step 4.9.2

Subtract $2$ from $3$ .

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

Step 4.10

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

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

Step 4.11

Simplify.

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Step 4.11.1

Apply the distributive property.

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

Step 4.11.2

Combine terms.

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Step 4.11.2.1

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

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

Step 4.11.2.2

Multiply $3$ by $3$ .

$3 x^{\frac{3}{2}} + x \frac{9 x^{\frac{1}{2}}}{2} + 2 \frac{3 x^{\frac{1}{2}}}{2}$

Step 4.11.2.3

Combine $x$ and $\frac{9 x^{\frac{1}{2}}}{2}$ .

$3 x^{\frac{3}{2}} + \frac{x (9 x^{\frac{1}{2}})}{2} + 2 \frac{3 x^{\frac{1}{2}}}{2}$

Step 4.11.2.4

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

$3 x^{\frac{3}{2}} + \frac{9 (x^{1} x^{\frac{1}{2}})}{2} + 2 \frac{3 x^{\frac{1}{2}}}{2}$

Step 4.11.2.5

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

$3 x^{\frac{3}{2}} + \frac{9 x^{1 + \frac{1}{2}}}{2} + 2 \frac{3 x^{\frac{1}{2}}}{2}$

Step 4.11.2.6

Write $1$ as a fraction with a common denominator.

$3 x^{\frac{3}{2}} + \frac{9 x^{\frac{2}{2} + \frac{1}{2}}}{2} + 2 \frac{3 x^{\frac{1}{2}}}{2}$

Step 4.11.2.7

Combine the numerators over the common denominator.

$3 x^{\frac{3}{2}} + \frac{9 x^{\frac{2 + 1}{2}}}{2} + 2 \frac{3 x^{\frac{1}{2}}}{2}$

Step 4.11.2.8

Add $2$ and $1$ .

$3 x^{\frac{3}{2}} + \frac{9 x^{\frac{3}{2}}}{2} + 2 \frac{3 x^{\frac{1}{2}}}{2}$

Step 4.11.2.9

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

$3 x^{\frac{3}{2}} + \frac{9 x^{\frac{3}{2}}}{2} + \frac{2 (3 x^{\frac{1}{2}})}{2}$

Step 4.11.2.10

Multiply $3$ by $2$ .

$3 x^{\frac{3}{2}} + \frac{9 x^{\frac{3}{2}}}{2} + \frac{6 x^{\frac{1}{2}}}{2}$

Step 4.11.2.11

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

$3 x^{\frac{3}{2}} + \frac{9 x^{\frac{3}{2}}}{2} + \frac{2 (3 x^{\frac{1}{2}})}{2}$

Step 4.11.2.12

Cancel the common factors.

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Step 4.11.2.12.1

Factor $2$ out of $2$ .

$3 x^{\frac{3}{2}} + \frac{9 x^{\frac{3}{2}}}{2} + \frac{2 (3 x^{\frac{1}{2}})}{2 (1)}$

Step 4.11.2.12.2

Cancel the common factor.

$3 x^{\frac{3}{2}} + \frac{9 x^{\frac{3}{2}}}{2} + \frac{2 (3 x^{\frac{1}{2}})}{2 \cdot 1}$

Step 4.11.2.12.3

Rewrite the expression.

$3 x^{\frac{3}{2}} + \frac{9 x^{\frac{3}{2}}}{2} + \frac{3 x^{\frac{1}{2}}}{1}$

Step 4.11.2.12.4

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

$3 x^{\frac{3}{2}} + \frac{9 x^{\frac{3}{2}}}{2} + 3 x^{\frac{1}{2}}$

Step 4.11.2.13

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

$3 x^{\frac{3}{2}} \cdot \frac{2}{2} + \frac{9 x^{\frac{3}{2}}}{2} + 3 x^{\frac{1}{2}}$

Step 4.11.2.14

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

$\frac{3 x^{\frac{3}{2}} \cdot 2}{2} + \frac{9 x^{\frac{3}{2}}}{2} + 3 x^{\frac{1}{2}}$

Step 4.11.2.15

Combine the numerators over the common denominator.

$\frac{3 x^{\frac{3}{2}} \cdot 2 + 9 x^{\frac{3}{2}}}{2} + 3 x^{\frac{1}{2}}$

Step 4.11.2.16

Multiply $2$ by $3$ .

$\frac{6 x^{\frac{3}{2}} + 9 x^{\frac{3}{2}}}{2} + 3 x^{\frac{1}{2}}$

Step 4.11.2.17

Add $6 x^{\frac{3}{2}}$ and $9 x^{\frac{3}{2}}$ .

$\frac{15 x^{\frac{3}{2}}}{2} + 3 x^{\frac{1}{2}}$

Step 4.11.3

Reorder terms.

$3 x^{\frac{1}{2}} + \frac{15 x^{\frac{3}{2}}}{2}$

Step 5

Reform the equation by setting the left side equal to the right side.

$y' = 3 x^{\frac{1}{2}} + \frac{15 x^{\frac{3}{2}}}{2}$

Step 6

Replace $y'$ with $\frac{d y}{d x}$ .

$\frac{d y}{d x} = 3 x^{\frac{1}{2}} + \frac{15 x^{\frac{3}{2}}}{2}$