Calculus Examples

$y = \sqrt{3 + 5 x}$ , $x = 0$

Step 1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{3 + 5 x}$ as ${(3 + 5 x)}^{\frac{1}{2}}$ .

$\frac{d}{d x} [{(3 + 5 x)}^{\frac{1}{2}}]$

Step 2

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 $g (x) = 3 + 5 x$ .

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Step 2.1

To apply the Chain Rule, set $u$ as $3 + 5 x$ .

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

Step 2.2

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

$\frac{1}{2} u^{\frac{1}{2} - 1} \frac{d}{d x} [3 + 5 x]$

Step 2.3

Replace all occurrences of $u$ with $3 + 5 x$ .

$\frac{1}{2} {(3 + 5 x)}^{\frac{1}{2} - 1} \frac{d}{d x} [3 + 5 x]$

Step 3

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

$\frac{1}{2} {(3 + 5 x)}^{\frac{1}{2} - 1 \cdot \frac{2}{2}} \frac{d}{d x} [3 + 5 x]$

Step 4

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

$\frac{1}{2} {(3 + 5 x)}^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} \frac{d}{d x} [3 + 5 x]$

Step 5

Combine the numerators over the common denominator.

$\frac{1}{2} {(3 + 5 x)}^{\frac{1 - 1 \cdot 2}{2}} \frac{d}{d x} [3 + 5 x]$

Step 6

Simplify the numerator.

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Step 6.1

Multiply $- 1$ by $2$ .

$\frac{1}{2} {(3 + 5 x)}^{\frac{1 - 2}{2}} \frac{d}{d x} [3 + 5 x]$

Step 6.2

Subtract $2$ from $1$ .

$\frac{1}{2} {(3 + 5 x)}^{\frac{- 1}{2}} \frac{d}{d x} [3 + 5 x]$

Step 7

Combine fractions.

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Step 7.1

Move the negative in front of the fraction.

$\frac{1}{2} {(3 + 5 x)}^{- \frac{1}{2}} \frac{d}{d x} [3 + 5 x]$

Step 7.2

Combine $\frac{1}{2}$ and ${(3 + 5 x)}^{- \frac{1}{2}}$ .

$\frac{{(3 + 5 x)}^{- \frac{1}{2}}}{2} \frac{d}{d x} [3 + 5 x]$

Step 7.3

Move ${(3 + 5 x)}^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{1}{2 {(3 + 5 x)}^{\frac{1}{2}}} \frac{d}{d x} [3 + 5 x]$

Step 8

By the Sum Rule, the derivative of $3 + 5 x$ with respect to $x$ is $\frac{d}{d x} [3] + \frac{d}{d x} [5 x]$ .

$\frac{1}{2 {(3 + 5 x)}^{\frac{1}{2}}} (\frac{d}{d x} [3] + \frac{d}{d x} [5 x])$

Step 9

Since $3$ is constant with respect to $x$ , the derivative of $3$ with respect to $x$ is $0$ .

$\frac{1}{2 {(3 + 5 x)}^{\frac{1}{2}}} (0 + \frac{d}{d x} [5 x])$

Step 10

Add $0$ and $\frac{d}{d x} [5 x]$ .

$\frac{1}{2 {(3 + 5 x)}^{\frac{1}{2}}} \frac{d}{d x} [5 x]$

Step 11

Since $5$ is constant with respect to $x$ , the derivative of $5 x$ with respect to $x$ is $5 \frac{d}{d x} [x]$ .

$\frac{1}{2 {(3 + 5 x)}^{\frac{1}{2}}} (5 \frac{d}{d x} [x])$

Step 12

Combine $5$ and $\frac{1}{2 {(3 + 5 x)}^{\frac{1}{2}}}$ .

$\frac{5}{2 {(3 + 5 x)}^{\frac{1}{2}}} \frac{d}{d x} [x]$

Step 13

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

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

Step 14

Multiply $\frac{5}{2 {(3 + 5 x)}^{\frac{1}{2}}}$ by $1$ .

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

Step 15

Evaluate the derivative at $x = 0$ .

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

Step 16

Simplify the denominator.

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Step 16.1

Multiply $5$ by $0$ .

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

Step 16.2

Add $3$ and $0$ .

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