Calculus Examples

$\int {(5 + x)}^{2} d x$

Step 1

Let $u = 5 + x$ . Then $d u = d x$ . Rewrite using $u$ and $d$ $u$ .

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Step 1.1

Let $u = 5 + x$ . Find $\frac{d u}{d x}$ .

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Step 1.1.1

Differentiate $5 + x$ .

$\frac{d}{d x} [5 + x]$

Step 1.1.2

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

$\frac{d}{d x} [5] + \frac{d}{d x} [x]$

Step 1.1.3

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

$0 + \frac{d}{d x} [x]$

Step 1.1.4

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

$0 + 1$

Step 1.1.5

Add $0$ and $1$ .

$1$

Step 1.2

Rewrite the problem using $u$ and $d u$ .

$\int u^{2} d u$

Step 2

By the Power Rule, the integral of $u^{2}$ with respect to $u$ is $\frac{1}{3} u^{3}$ .

$\frac{1}{3} u^{3} + C$

Step 3

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

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