Pre-Algebra Examples

$\frac{8 x^{4} - 68 x^{3} + 230 x^{2} - 84 x - 50}{x^{2} - 8 x + 25}$

Step 1

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

$x^{2}$

$8 x$

$25$

$8 x^{4}$

$68 x^{3}$

$230 x^{2}$

$84 x$

$50$

Step 2

Divide the highest order term in the dividend $8 x^{4}$ by the highest order term in divisor $x^{2}$ .

							$8 x^{2}$
	$x^{2}$	-	$8 x$	+	$25$		$8 x^{4}$	-	$68 x^{3}$	+	$230 x^{2}$	-	$84 x$	-	$50$

Step 3

Multiply the new quotient term by the divisor.

$8 x^{2}$

$x^{2}$

$8 x$

$25$

$8 x^{4}$

$68 x^{3}$

$230 x^{2}$

$84 x$

$50$

$8 x^{4}$

$64 x^{3}$

$200 x^{2}$

Step 4

The expression needs to be subtracted from the dividend, so change all the signs in $8 x^{4} - 64 x^{3} + 200 x^{2}$

$8 x^{2}$

$x^{2}$

$8 x$

$25$

$8 x^{4}$

$68 x^{3}$

$230 x^{2}$

$84 x$

$50$

$8 x^{4}$

$64 x^{3}$

$200 x^{2}$

Step 5

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

$8 x^{2}$

$x^{2}$

$8 x$

$25$

$8 x^{4}$

$68 x^{3}$

$230 x^{2}$

$84 x$

$50$

$8 x^{4}$

$64 x^{3}$

$200 x^{2}$

$4 x^{3}$

$30 x^{2}$

Step 6

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

$8 x^{2}$

$x^{2}$

$8 x$

$25$

$8 x^{4}$

$68 x^{3}$

$230 x^{2}$

$84 x$

$50$

$8 x^{4}$

$64 x^{3}$

$200 x^{2}$

$4 x^{3}$

$30 x^{2}$

$84 x$

Step 7

Divide the highest order term in the dividend $- 4 x^{3}$ by the highest order term in divisor $x^{2}$ .

$8 x^{2}$

$4 x$

$x^{2}$

$8 x$

$25$

$8 x^{4}$

$68 x^{3}$

$230 x^{2}$

$84 x$

$50$

$8 x^{4}$

$64 x^{3}$

$200 x^{2}$

$4 x^{3}$

$30 x^{2}$

$84 x$

Step 8

Multiply the new quotient term by the divisor.

$8 x^{2}$

$4 x$

$x^{2}$

$8 x$

$25$

$8 x^{4}$

$68 x^{3}$

$230 x^{2}$

$84 x$

$50$

$8 x^{4}$

$64 x^{3}$

$200 x^{2}$

$4 x^{3}$

$30 x^{2}$

$84 x$

$4 x^{3}$

$32 x^{2}$

$100 x$

Step 9

The expression needs to be subtracted from the dividend, so change all the signs in $- 4 x^{3} + 32 x^{2} - 100 x$

$8 x^{2}$

$4 x$

$x^{2}$

$8 x$

$25$

$8 x^{4}$

$68 x^{3}$

$230 x^{2}$

$84 x$

$50$

$8 x^{4}$

$64 x^{3}$

$200 x^{2}$

$4 x^{3}$

$30 x^{2}$

$84 x$

$4 x^{3}$

$32 x^{2}$

$100 x$

Step 10

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

$8 x^{2}$

$4 x$

$x^{2}$

$8 x$

$25$

$8 x^{4}$

$68 x^{3}$

$230 x^{2}$

$84 x$

$50$

$8 x^{4}$

$64 x^{3}$

$200 x^{2}$

$4 x^{3}$

$30 x^{2}$

$84 x$

$4 x^{3}$

$32 x^{2}$

$100 x$

$2 x^{2}$

$16 x$

Step 11

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

$8 x^{2}$

$4 x$

$x^{2}$

$8 x$

$25$

$8 x^{4}$

$68 x^{3}$

$230 x^{2}$

$84 x$

$50$

$8 x^{4}$

$64 x^{3}$

$200 x^{2}$

$4 x^{3}$

$30 x^{2}$

$84 x$

$4 x^{3}$

$32 x^{2}$

$100 x$

$2 x^{2}$

$16 x$

$50$

Step 12

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

$8 x^{2}$

$4 x$

$2$

$x^{2}$

$8 x$

$25$

$8 x^{4}$

$68 x^{3}$

$230 x^{2}$

$84 x$

$50$

$8 x^{4}$

$64 x^{3}$

$200 x^{2}$

$4 x^{3}$

$30 x^{2}$

$84 x$

$4 x^{3}$

$32 x^{2}$

$100 x$

$2 x^{2}$

$16 x$

$50$

Step 13

Multiply the new quotient term by the divisor.

						$8 x^{2}$	-	$4 x$	-	$2$
$x^{2}$	-	$8 x$	+	$25$		$8 x^{4}$	-	$68 x^{3}$	+	$230 x^{2}$	-	$84 x$	-	$50$
					-	$8 x^{4}$	+	$64 x^{3}$	-	$200 x^{2}$
							-	$4 x^{3}$	+	$30 x^{2}$	-	$84 x$
							+	$4 x^{3}$	-	$32 x^{2}$	+	$100 x$
									-	$2 x^{2}$	+	$16 x$	-	$50$
									-	$2 x^{2}$	+	$16 x$	-	$50$

Step 14

The expression needs to be subtracted from the dividend, so change all the signs in $- 2 x^{2} + 16 x - 50$

$8 x^{2}$

$4 x$

$2$

$x^{2}$

$8 x$

$25$

$8 x^{4}$

$68 x^{3}$

$230 x^{2}$

$84 x$

$50$

$8 x^{4}$

$64 x^{3}$

$200 x^{2}$

$4 x^{3}$

$30 x^{2}$

$84 x$

$4 x^{3}$

$32 x^{2}$

$100 x$

$2 x^{2}$

$16 x$

$50$

$2 x^{2}$

$16 x$

$50$

Step 15

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

						$8 x^{2}$	-	$4 x$	-	$2$
$x^{2}$	-	$8 x$	+	$25$		$8 x^{4}$	-	$68 x^{3}$	+	$230 x^{2}$	-	$84 x$	-	$50$
					-	$8 x^{4}$	+	$64 x^{3}$	-	$200 x^{2}$
							-	$4 x^{3}$	+	$30 x^{2}$	-	$84 x$
							+	$4 x^{3}$	-	$32 x^{2}$	+	$100 x$
									-	$2 x^{2}$	+	$16 x$	-	$50$
									+	$2 x^{2}$	-	$16 x$	+	$50$
														$0$

Step 16

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

$8 x^{2} - 4 x - 2$