Calculus Examples

$- 5 x \sqrt{x + 7}$

Step 1

Differentiate using the Constant Multiple Rule.

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Step 1.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{x + 7}$ as ${(x + 7)}^{\frac{1}{2}}$ .

$\frac{d}{d x} [- 5 x {(x + 7)}^{\frac{1}{2}}]$

Step 1.2

Since $- 5$ is constant with respect to $x$ , the derivative of $- 5 x {(x + 7)}^{\frac{1}{2}}$ with respect to $x$ is $- 5 \frac{d}{d x} [x {(x + 7)}^{\frac{1}{2}}]$ .

$- 5 \frac{d}{d x} [x {(x + 7)}^{\frac{1}{2}}]$

Step 2

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 $f (x) = x$ and $g (x) = {(x + 7)}^{\frac{1}{2}}$ .

$- 5 (x \frac{d}{d x} [{(x + 7)}^{\frac{1}{2}}] + {(x + 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 3

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{\frac{1}{2}}$ and $g (x) = x + 7$ .

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Step 3.1

To apply the Chain Rule, set $u$ as $x + 7$ .

$- 5 (x (\frac{d}{d u} [u^{\frac{1}{2}}] \frac{d}{d x} [x + 7]) + {(x + 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 3.2

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

$- 5 (x (\frac{1}{2} u^{\frac{1}{2} - 1} \frac{d}{d x} [x + 7]) + {(x + 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 3.3

Replace all occurrences of $u$ with $x + 7$ .

$- 5 (x (\frac{1}{2} {(x + 7)}^{\frac{1}{2} - 1} \frac{d}{d x} [x + 7]) + {(x + 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 4

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

$- 5 (x (\frac{1}{2} {(x + 7)}^{\frac{1}{2} - 1 \cdot \frac{2}{2}} \frac{d}{d x} [x + 7]) + {(x + 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 5

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

$- 5 (x (\frac{1}{2} {(x + 7)}^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} \frac{d}{d x} [x + 7]) + {(x + 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 6

Combine the numerators over the common denominator.

$- 5 (x (\frac{1}{2} {(x + 7)}^{\frac{1 - 1 \cdot 2}{2}} \frac{d}{d x} [x + 7]) + {(x + 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 7

Simplify the numerator.

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Step 7.1

Multiply $- 1$ by $2$ .

$- 5 (x (\frac{1}{2} {(x + 7)}^{\frac{1 - 2}{2}} \frac{d}{d x} [x + 7]) + {(x + 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 7.2

Subtract $2$ from $1$ .

$- 5 (x (\frac{1}{2} {(x + 7)}^{\frac{- 1}{2}} \frac{d}{d x} [x + 7]) + {(x + 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 8

Combine fractions.

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Step 8.1

Move the negative in front of the fraction.

$- 5 (x (\frac{1}{2} {(x + 7)}^{- \frac{1}{2}} \frac{d}{d x} [x + 7]) + {(x + 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 8.2

Combine $\frac{1}{2}$ and ${(x + 7)}^{- \frac{1}{2}}$ .

$- 5 (x (\frac{{(x + 7)}^{- \frac{1}{2}}}{2} \frac{d}{d x} [x + 7]) + {(x + 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 8.3

Move ${(x + 7)}^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$- 5 (x (\frac{1}{2 {(x + 7)}^{\frac{1}{2}}} \frac{d}{d x} [x + 7]) + {(x + 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 8.4

Combine $\frac{1}{2 {(x + 7)}^{\frac{1}{2}}}$ and $x$ .

$- 5 (\frac{x}{2 {(x + 7)}^{\frac{1}{2}}} \frac{d}{d x} [x + 7] + {(x + 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 9

By the Sum Rule, the derivative of $x + 7$ with respect to $x$ is $\frac{d}{d x} [x] + \frac{d}{d x} [7]$ .

$- 5 (\frac{x}{2 {(x + 7)}^{\frac{1}{2}}} (\frac{d}{d x} [x] + \frac{d}{d x} [7]) + {(x + 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 10

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

$- 5 (\frac{x}{2 {(x + 7)}^{\frac{1}{2}}} (1 + \frac{d}{d x} [7]) + {(x + 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 11

Since $7$ is constant with respect to $x$ , the derivative of $7$ with respect to $x$ is $0$ .

$- 5 (\frac{x}{2 {(x + 7)}^{\frac{1}{2}}} (1 + 0) + {(x + 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 12

Simplify the expression.

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Step 12.1

Add $1$ and $0$ .

$- 5 (\frac{x}{2 {(x + 7)}^{\frac{1}{2}}} \cdot 1 + {(x + 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 12.2

Multiply $\frac{x}{2 {(x + 7)}^{\frac{1}{2}}}$ by $1$ .

$- 5 (\frac{x}{2 {(x + 7)}^{\frac{1}{2}}} + {(x + 7)}^{\frac{1}{2}} \frac{d}{d x} [x])$

Step 13

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

$- 5 (\frac{x}{2 {(x + 7)}^{\frac{1}{2}}} + {(x + 7)}^{\frac{1}{2}} \cdot 1)$

Step 14

Multiply ${(x + 7)}^{\frac{1}{2}}$ by $1$ .

$- 5 (\frac{x}{2 {(x + 7)}^{\frac{1}{2}}} + {(x + 7)}^{\frac{1}{2}})$

Step 15

To write ${(x + 7)}^{\frac{1}{2}}$ as a fraction with a common denominator, multiply by $\frac{2 {(x + 7)}^{\frac{1}{2}}}{2 {(x + 7)}^{\frac{1}{2}}}$ .

$- 5 (\frac{x}{2 {(x + 7)}^{\frac{1}{2}}} + {(x + 7)}^{\frac{1}{2}} \cdot \frac{2 {(x + 7)}^{\frac{1}{2}}}{2 {(x + 7)}^{\frac{1}{2}}})$

Step 16

Combine ${(x + 7)}^{\frac{1}{2}}$ and $\frac{2 {(x + 7)}^{\frac{1}{2}}}{2 {(x + 7)}^{\frac{1}{2}}}$ .

$- 5 (\frac{x}{2 {(x + 7)}^{\frac{1}{2}}} + \frac{{(x + 7)}^{\frac{1}{2}} (2 {(x + 7)}^{\frac{1}{2}})}{2 {(x + 7)}^{\frac{1}{2}}})$

Step 17

Combine the numerators over the common denominator.

$- 5 \frac{x + {(x + 7)}^{\frac{1}{2}} (2 {(x + 7)}^{\frac{1}{2}})}{2 {(x + 7)}^{\frac{1}{2}}}$

Step 18

Multiply ${(x + 7)}^{\frac{1}{2}}$ by ${(x + 7)}^{\frac{1}{2}}$ by adding the exponents.

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Step 18.1

Move ${(x + 7)}^{\frac{1}{2}}$ .

$- 5 \frac{x + {(x + 7)}^{\frac{1}{2}} {(x + 7)}^{\frac{1}{2}} \cdot 2}{2 {(x + 7)}^{\frac{1}{2}}}$

Step 18.2

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

$- 5 \frac{x + {(x + 7)}^{\frac{1}{2} + \frac{1}{2}} \cdot 2}{2 {(x + 7)}^{\frac{1}{2}}}$

Step 18.3

Combine the numerators over the common denominator.

$- 5 \frac{x + {(x + 7)}^{\frac{1 + 1}{2}} \cdot 2}{2 {(x + 7)}^{\frac{1}{2}}}$

Step 18.4

Add $1$ and $1$ .

$- 5 \frac{x + {(x + 7)}^{\frac{2}{2}} \cdot 2}{2 {(x + 7)}^{\frac{1}{2}}}$

Step 18.5

Divide $2$ by $2$ .

$- 5 \frac{x + {(x + 7)}^{1} \cdot 2}{2 {(x + 7)}^{\frac{1}{2}}}$

Step 19

Simplify the expression.

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Step 19.1

Simplify ${(x + 7)}^{1} \cdot 2$ .

$- 5 \frac{x + (x + 7) \cdot 2}{2 {(x + 7)}^{\frac{1}{2}}}$

Step 19.2

Move $2$ to the left of $x + 7$ .

$- 5 \frac{x + 2 \cdot (x + 7)}{2 {(x + 7)}^{\frac{1}{2}}}$

Step 20

Combine $- 5$ and $\frac{x + 2 (x + 7)}{2 {(x + 7)}^{\frac{1}{2}}}$ .

$\frac{- 5 (x + 2 (x + 7))}{2 {(x + 7)}^{\frac{1}{2}}}$

Step 21

Move the negative in front of the fraction.

$- \frac{5 (x + 2 (x + 7))}{2 {(x + 7)}^{\frac{1}{2}}}$

Step 22

Simplify.

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Step 22.1

Apply the distributive property.

$- \frac{5 (x + 2 x + 2 \cdot 7)}{2 {(x + 7)}^{\frac{1}{2}}}$

Step 22.2

Apply the distributive property.

$- \frac{5 x + 5 (2 x) + 5 (2 \cdot 7)}{2 {(x + 7)}^{\frac{1}{2}}}$

Step 22.3

Simplify the numerator.

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Step 22.3.1

Simplify each term.

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Step 22.3.1.1

Multiply $2$ by $5$ .

$- \frac{5 x + 10 x + 5 (2 \cdot 7)}{2 {(x + 7)}^{\frac{1}{2}}}$

Step 22.3.1.2

Multiply $5 (2 \cdot 7)$ .

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Step 22.3.1.2.1

Multiply $2$ by $7$ .

$- \frac{5 x + 10 x + 5 \cdot 14}{2 {(x + 7)}^{\frac{1}{2}}}$

Step 22.3.1.2.2

Multiply $5$ by $14$ .

$- \frac{5 x + 10 x + 70}{2 {(x + 7)}^{\frac{1}{2}}}$

Step 22.3.2

Add $5 x$ and $10 x$ .

$- \frac{15 x + 70}{2 {(x + 7)}^{\frac{1}{2}}}$

Step 22.4

Factor $5$ out of $15 x + 70$ .

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Step 22.4.1

Factor $5$ out of $15 x$ .

$- \frac{5 (3 x) + 70}{2 {(x + 7)}^{\frac{1}{2}}}$

Step 22.4.2

Factor $5$ out of $70$ .

$- \frac{5 (3 x) + 5 (14)}{2 {(x + 7)}^{\frac{1}{2}}}$

Step 22.4.3

Factor $5$ out of $5 (3 x) + 5 (14)$ .

$- \frac{5 (3 x + 14)}{2 {(x + 7)}^{\frac{1}{2}}}$