Calculus Examples

$\int \frac{x^{3} + 125}{x + 5} d x$

Step 1

Divide $x^{3} + 125$ by $x + 5$ .

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Step 1.1

Set up the polynomials to be divided. If there is not a term for every exponent, insert one with a value of $0$ .

$x$

$5$

$x^{3}$

$0 x^{2}$

$0 x$

$125$

Step 1.2

Divide the highest order term in the dividend $x^{3}$ by the highest order term in divisor $x$ .

					$x^{2}$
	$x$	+	$5$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	+	$125$

Step 1.3

Multiply the new quotient term by the divisor.

				$x^{2}$
$x$	+	$5$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	+	$125$
			+	$x^{3}$	+	$5 x^{2}$

Step 1.4

The expression needs to be subtracted from the dividend, so change all the signs in $x^{3} + 5 x^{2}$

				$x^{2}$
$x$	+	$5$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	+	$125$
			-	$x^{3}$	-	$5 x^{2}$

Step 1.5

After changing the signs, add the last dividend from the multiplied polynomial to find the new dividend.

				$x^{2}$
$x$	+	$5$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	+	$125$
			-	$x^{3}$	-	$5 x^{2}$
					-	$5 x^{2}$

Step 1.6

Pull the next terms from the original dividend down into the current dividend.

				$x^{2}$
$x$	+	$5$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	+	$125$
			-	$x^{3}$	-	$5 x^{2}$
					-	$5 x^{2}$	+	$0 x$

Step 1.7

Divide the highest order term in the dividend $- 5 x^{2}$ by the highest order term in divisor $x$ .

				$x^{2}$	-	$5 x$
$x$	+	$5$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	+	$125$
			-	$x^{3}$	-	$5 x^{2}$
					-	$5 x^{2}$	+	$0 x$

Step 1.8

Multiply the new quotient term by the divisor.

				$x^{2}$	-	$5 x$
$x$	+	$5$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	+	$125$
			-	$x^{3}$	-	$5 x^{2}$
					-	$5 x^{2}$	+	$0 x$
					-	$5 x^{2}$	-	$25 x$

Step 1.9

The expression needs to be subtracted from the dividend, so change all the signs in $- 5 x^{2} - 25 x$

				$x^{2}$	-	$5 x$
$x$	+	$5$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	+	$125$
			-	$x^{3}$	-	$5 x^{2}$
					-	$5 x^{2}$	+	$0 x$
					+	$5 x^{2}$	+	$25 x$

Step 1.10

After changing the signs, add the last dividend from the multiplied polynomial to find the new dividend.

				$x^{2}$	-	$5 x$
$x$	+	$5$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	+	$125$
			-	$x^{3}$	-	$5 x^{2}$
					-	$5 x^{2}$	+	$0 x$
					+	$5 x^{2}$	+	$25 x$
							+	$25 x$

Step 1.11

Pull the next terms from the original dividend down into the current dividend.

				$x^{2}$	-	$5 x$
$x$	+	$5$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	+	$125$
			-	$x^{3}$	-	$5 x^{2}$
					-	$5 x^{2}$	+	$0 x$
					+	$5 x^{2}$	+	$25 x$
							+	$25 x$	+	$125$

Step 1.12

Divide the highest order term in the dividend $25 x$ by the highest order term in divisor $x$ .

				$x^{2}$	-	$5 x$	+	$25$
$x$	+	$5$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	+	$125$
			-	$x^{3}$	-	$5 x^{2}$
					-	$5 x^{2}$	+	$0 x$
					+	$5 x^{2}$	+	$25 x$
							+	$25 x$	+	$125$

Step 1.13

Multiply the new quotient term by the divisor.

				$x^{2}$	-	$5 x$	+	$25$
$x$	+	$5$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	+	$125$
			-	$x^{3}$	-	$5 x^{2}$
					-	$5 x^{2}$	+	$0 x$
					+	$5 x^{2}$	+	$25 x$
							+	$25 x$	+	$125$
							+	$25 x$	+	$125$

Step 1.14

The expression needs to be subtracted from the dividend, so change all the signs in $25 x + 125$

				$x^{2}$	-	$5 x$	+	$25$
$x$	+	$5$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	+	$125$
			-	$x^{3}$	-	$5 x^{2}$
					-	$5 x^{2}$	+	$0 x$
					+	$5 x^{2}$	+	$25 x$
							+	$25 x$	+	$125$
							-	$25 x$	-	$125$

Step 1.15

After changing the signs, add the last dividend from the multiplied polynomial to find the new dividend.

				$x^{2}$	-	$5 x$	+	$25$
$x$	+	$5$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	+	$125$
			-	$x^{3}$	-	$5 x^{2}$
					-	$5 x^{2}$	+	$0 x$
					+	$5 x^{2}$	+	$25 x$
							+	$25 x$	+	$125$
							-	$25 x$	-	$125$
										$0$

Step 1.16

Since the remander is $0$ , the final answer is the quotient.

$\int x^{2} - 5 x + 25 d x$

Step 2

Split the single integral into multiple integrals.

$\int x^{2} d x + \int - 5 x d x + \int 25 d x$

Step 3

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

$\frac{1}{3} x^{3} + C + \int - 5 x d x + \int 25 d x$

Step 4

Since $- 5$ is constant with respect to $x$ , move $- 5$ out of the integral.

$\frac{1}{3} x^{3} + C - 5 \int x d x + \int 25 d x$

Step 5

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

$\frac{1}{3} x^{3} + C - 5 (\frac{1}{2} x^{2} + C) + \int 25 d x$

Step 6

Apply the constant rule.

$\frac{1}{3} x^{3} + C - 5 (\frac{1}{2} x^{2} + C) + 25 x + C$

Step 7

Simplify.

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Step 7.1

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

$\frac{1}{3} x^{3} + C - 5 (\frac{x^{2}}{2} + C) + 25 x + C$

Step 7.2

Simplify.

$\frac{x^{3}}{3} - \frac{5 x^{2}}{2} + 25 x + C$

Step 8

Reorder terms.

$\frac{1}{3} x^{3} - \frac{5}{2} x^{2} + 25 x + C$