Calculus Examples

$y = \sqrt{5 - 9 x}$

Step 1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{5 - 9 x}$ as ${(5 - 9 x)}^{\frac{1}{2}}$ .

$y = {(5 - 9 x)}^{\frac{1}{2}}$

Step 2

Differentiate both sides of the equation.

$\frac{d}{d x} (y) = \frac{d}{d x} ({(5 - 9 x)}^{\frac{1}{2}})$

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

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 $g (x) = 5 - 9 x$ .

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Step 4.1.1

To apply the Chain Rule, set $u$ as $5 - 9 x$ .

$\frac{d}{d u} [u^{\frac{1}{2}}] \frac{d}{d x} [5 - 9 x]$

Step 4.1.2

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

$\frac{1}{2} u^{\frac{1}{2} - 1} \frac{d}{d x} [5 - 9 x]$

Step 4.1.3

Replace all occurrences of $u$ with $5 - 9 x$ .

$\frac{1}{2} {(5 - 9 x)}^{\frac{1}{2} - 1} \frac{d}{d x} [5 - 9 x]$

Step 4.2

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

$\frac{1}{2} {(5 - 9 x)}^{\frac{1}{2} - 1 \cdot \frac{2}{2}} \frac{d}{d x} [5 - 9 x]$

Step 4.3

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

$\frac{1}{2} {(5 - 9 x)}^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} \frac{d}{d x} [5 - 9 x]$

Step 4.4

Combine the numerators over the common denominator.

$\frac{1}{2} {(5 - 9 x)}^{\frac{1 - 1 \cdot 2}{2}} \frac{d}{d x} [5 - 9 x]$

Step 4.5

Simplify the numerator.

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Step 4.5.1

Multiply $- 1$ by $2$ .

$\frac{1}{2} {(5 - 9 x)}^{\frac{1 - 2}{2}} \frac{d}{d x} [5 - 9 x]$

Step 4.5.2

Subtract $2$ from $1$ .

$\frac{1}{2} {(5 - 9 x)}^{\frac{- 1}{2}} \frac{d}{d x} [5 - 9 x]$

Step 4.6

Combine fractions.

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Step 4.6.1

Move the negative in front of the fraction.

$\frac{1}{2} {(5 - 9 x)}^{- \frac{1}{2}} \frac{d}{d x} [5 - 9 x]$

Step 4.6.2

Combine $\frac{1}{2}$ and ${(5 - 9 x)}^{- \frac{1}{2}}$ .

$\frac{{(5 - 9 x)}^{- \frac{1}{2}}}{2} \frac{d}{d x} [5 - 9 x]$

Step 4.6.3

Move ${(5 - 9 x)}^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{1}{2 {(5 - 9 x)}^{\frac{1}{2}}} \frac{d}{d x} [5 - 9 x]$

Step 4.7

By the Sum Rule, the derivative of $5 - 9 x$ with respect to $x$ is $\frac{d}{d x} [5] + \frac{d}{d x} [- 9 x]$ .

$\frac{1}{2 {(5 - 9 x)}^{\frac{1}{2}}} (\frac{d}{d x} [5] + \frac{d}{d x} [- 9 x])$

Step 4.8

Since $5$ is constant with respect to $x$ , the derivative of $5$ with respect to $x$ is $0$ .

$\frac{1}{2 {(5 - 9 x)}^{\frac{1}{2}}} (0 + \frac{d}{d x} [- 9 x])$

Step 4.9

Add $0$ and $\frac{d}{d x} [- 9 x]$ .

$\frac{1}{2 {(5 - 9 x)}^{\frac{1}{2}}} \frac{d}{d x} [- 9 x]$

Step 4.10

Since $- 9$ is constant with respect to $x$ , the derivative of $- 9 x$ with respect to $x$ is $- 9 \frac{d}{d x} [x]$ .

$\frac{1}{2 {(5 - 9 x)}^{\frac{1}{2}}} (- 9 \frac{d}{d x} [x])$

Step 4.11

Combine fractions.

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Step 4.11.1

Combine $- 9$ and $\frac{1}{2 {(5 - 9 x)}^{\frac{1}{2}}}$ .

$\frac{- 9}{2 {(5 - 9 x)}^{\frac{1}{2}}} \frac{d}{d x} [x]$

Step 4.11.2

Move the negative in front of the fraction.

$- \frac{9}{2 {(5 - 9 x)}^{\frac{1}{2}}} \frac{d}{d x} [x]$

Step 4.12

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

$- \frac{9}{2 {(5 - 9 x)}^{\frac{1}{2}}} \cdot 1$

Step 4.13

Multiply $- 1$ by $1$ .

$- \frac{9}{2 {(5 - 9 x)}^{\frac{1}{2}}}$

Step 5

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

$y' = - \frac{9}{2 {(5 - 9 x)}^{\frac{1}{2}}}$

Step 6

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

$\frac{d y}{d x} = - \frac{9}{2 {(5 - 9 x)}^{\frac{1}{2}}}$