Pre-Algebra Examples

$\frac{5 x^{3} - 32 x^{2} - 36 x - 9}{5 x + 3}$

Step 1

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

$5 x$

$3$

$5 x^{3}$

$32 x^{2}$

$36 x$

$9$

Step 2

Divide the highest order term in the dividend $5 x^{3}$ by the highest order term in divisor $5 x$ .

					$x^{2}$
	$5 x$	+	$3$		$5 x^{3}$	-	$32 x^{2}$	-	$36 x$	-	$9$

Step 3

Multiply the new quotient term by the divisor.

				$x^{2}$
$5 x$	+	$3$		$5 x^{3}$	-	$32 x^{2}$	-	$36 x$	-	$9$
			+	$5 x^{3}$	+	$3 x^{2}$

Step 4

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

				$x^{2}$
$5 x$	+	$3$		$5 x^{3}$	-	$32 x^{2}$	-	$36 x$	-	$9$
			-	$5 x^{3}$	-	$3 x^{2}$

Step 5

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

				$x^{2}$
$5 x$	+	$3$		$5 x^{3}$	-	$32 x^{2}$	-	$36 x$	-	$9$
			-	$5 x^{3}$	-	$3 x^{2}$
					-	$35 x^{2}$

Step 6

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

				$x^{2}$
$5 x$	+	$3$		$5 x^{3}$	-	$32 x^{2}$	-	$36 x$	-	$9$
			-	$5 x^{3}$	-	$3 x^{2}$
					-	$35 x^{2}$	-	$36 x$

Step 7

Divide the highest order term in the dividend $- 35 x^{2}$ by the highest order term in divisor $5 x$ .

				$x^{2}$	-	$7 x$
$5 x$	+	$3$		$5 x^{3}$	-	$32 x^{2}$	-	$36 x$	-	$9$
			-	$5 x^{3}$	-	$3 x^{2}$
					-	$35 x^{2}$	-	$36 x$

Step 8

Multiply the new quotient term by the divisor.

				$x^{2}$	-	$7 x$
$5 x$	+	$3$		$5 x^{3}$	-	$32 x^{2}$	-	$36 x$	-	$9$
			-	$5 x^{3}$	-	$3 x^{2}$
					-	$35 x^{2}$	-	$36 x$
					-	$35 x^{2}$	-	$21 x$

Step 9

The expression needs to be subtracted from the dividend, so change all the signs in $- 35 x^{2} - 21 x$

				$x^{2}$	-	$7 x$
$5 x$	+	$3$		$5 x^{3}$	-	$32 x^{2}$	-	$36 x$	-	$9$
			-	$5 x^{3}$	-	$3 x^{2}$
					-	$35 x^{2}$	-	$36 x$
					+	$35 x^{2}$	+	$21 x$

Step 10

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

				$x^{2}$	-	$7 x$
$5 x$	+	$3$		$5 x^{3}$	-	$32 x^{2}$	-	$36 x$	-	$9$
			-	$5 x^{3}$	-	$3 x^{2}$
					-	$35 x^{2}$	-	$36 x$
					+	$35 x^{2}$	+	$21 x$
							-	$15 x$

Step 11

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

				$x^{2}$	-	$7 x$
$5 x$	+	$3$		$5 x^{3}$	-	$32 x^{2}$	-	$36 x$	-	$9$
			-	$5 x^{3}$	-	$3 x^{2}$
					-	$35 x^{2}$	-	$36 x$
					+	$35 x^{2}$	+	$21 x$
							-	$15 x$	-	$9$

Step 12

Divide the highest order term in the dividend $- 15 x$ by the highest order term in divisor $5 x$ .

				$x^{2}$	-	$7 x$	-	$3$
$5 x$	+	$3$		$5 x^{3}$	-	$32 x^{2}$	-	$36 x$	-	$9$
			-	$5 x^{3}$	-	$3 x^{2}$
					-	$35 x^{2}$	-	$36 x$
					+	$35 x^{2}$	+	$21 x$
							-	$15 x$	-	$9$

Step 13

Multiply the new quotient term by the divisor.

				$x^{2}$	-	$7 x$	-	$3$
$5 x$	+	$3$		$5 x^{3}$	-	$32 x^{2}$	-	$36 x$	-	$9$
			-	$5 x^{3}$	-	$3 x^{2}$
					-	$35 x^{2}$	-	$36 x$
					+	$35 x^{2}$	+	$21 x$
							-	$15 x$	-	$9$
							-	$15 x$	-	$9$

Step 14

The expression needs to be subtracted from the dividend, so change all the signs in $- 15 x - 9$

				$x^{2}$	-	$7 x$	-	$3$
$5 x$	+	$3$		$5 x^{3}$	-	$32 x^{2}$	-	$36 x$	-	$9$
			-	$5 x^{3}$	-	$3 x^{2}$
					-	$35 x^{2}$	-	$36 x$
					+	$35 x^{2}$	+	$21 x$
							-	$15 x$	-	$9$
							+	$15 x$	+	$9$

Step 15

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

				$x^{2}$	-	$7 x$	-	$3$
$5 x$	+	$3$		$5 x^{3}$	-	$32 x^{2}$	-	$36 x$	-	$9$
			-	$5 x^{3}$	-	$3 x^{2}$
					-	$35 x^{2}$	-	$36 x$
					+	$35 x^{2}$	+	$21 x$
							-	$15 x$	-	$9$
							+	$15 x$	+	$9$
										$0$

Step 16

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

$x^{2} - 7 x - 3$