Calculus Examples

$f (x) = \frac{6}{x} - 2$

Step 1

By the Sum Rule, the derivative of $\frac{6}{x} - 2$ with respect to $x$ is $\frac{d}{d x} [\frac{6}{x}] + \frac{d}{d x} [- 2]$ .

$\frac{d}{d x} [\frac{6}{x}] + \frac{d}{d x} [- 2]$

Step 2

Evaluate $\frac{d}{d x} [\frac{6}{x}]$ .

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Step 2.1

Since $6$ is constant with respect to $x$ , the derivative of $\frac{6}{x}$ with respect to $x$ is $6 \frac{d}{d x} [\frac{1}{x}]$ .

$6 \frac{d}{d x} [\frac{1}{x}] + \frac{d}{d x} [- 2]$

Step 2.2

Rewrite $\frac{1}{x}$ as $x^{- 1}$ .

$6 \frac{d}{d x} [x^{- 1}] + \frac{d}{d x} [- 2]$

Step 2.3

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

$6 (- x^{- 2}) + \frac{d}{d x} [- 2]$

Step 2.4

Multiply $- 1$ by $6$ .

$- 6 x^{- 2} + \frac{d}{d x} [- 2]$

Step 3

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

$- 6 x^{- 2} + 0$

Step 4

Simplify.

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Step 4.1

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$- 6 \frac{1}{x^{2}} + 0$

Step 4.2

Combine terms.

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Step 4.2.1

Combine $- 6$ and $\frac{1}{x^{2}}$ .

$\frac{- 6}{x^{2}} + 0$

Step 4.2.2

Move the negative in front of the fraction.

$- \frac{6}{x^{2}} + 0$

Step 4.2.3

Add $- \frac{6}{x^{2}}$ and $0$ .

$- \frac{6}{x^{2}}$