Calculus Examples

$\log (x^{3} + 1)$

Step 1

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = \log (x)$ and $g (x) = x^{3} + 1$ .

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Step 1.1

To apply the Chain Rule, set $u$ as $x^{3} + 1$ .

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

Step 1.2

The derivative of $\log (u)$ with respect to $u$ is $\frac{1}{u \ln (10)}$ .

$\frac{1}{u \ln (10)} \frac{d}{d x} [x^{3} + 1]$

Step 1.3

Replace all occurrences of $u$ with $x^{3} + 1$ .

$\frac{1}{(x^{3} + 1) \ln (10)} \frac{d}{d x} [x^{3} + 1]$

Step 2

Differentiate.

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Step 2.1

By the Sum Rule, the derivative of $x^{3} + 1$ with respect to $x$ is $\frac{d}{d x} [x^{3}] + \frac{d}{d x} [1]$ .

$\frac{1}{(x^{3} + 1) \ln (10)} (\frac{d}{d x} [x^{3}] + \frac{d}{d x} [1])$

Step 2.2

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

$\frac{1}{(x^{3} + 1) \ln (10)} (3 x^{2} + \frac{d}{d x} [1])$

Step 2.3

Since $1$ is constant with respect to $x$ , the derivative of $1$ with respect to $x$ is $0$ .

$\frac{1}{(x^{3} + 1) \ln (10)} (3 x^{2} + 0)$

Step 2.4

Combine fractions.

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Step 2.4.1

Add $3 x^{2}$ and $0$ .

$\frac{1}{(x^{3} + 1) \ln (10)} (3 x^{2})$

Step 2.4.2

Combine $3$ and $\frac{1}{(x^{3} + 1) \ln (10)}$ .

$\frac{3}{(x^{3} + 1) \ln (10)} x^{2}$

Step 2.4.3

Combine $\frac{3}{(x^{3} + 1) \ln (10)}$ and $x^{2}$ .

$\frac{3 x^{2}}{(x^{3} + 1) \ln (10)}$

Step 3

Simplify.

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Step 3.1

Apply the distributive property.

$\frac{3 x^{2}}{x^{3} \ln (10) + 1 \ln (10)}$

Step 3.2

Multiply $\ln (10)$ by $1$ .

$\frac{3 x^{2}}{x^{3} \ln (10) + \ln (10)}$