Algebra Examples

$(8 x^{5} - 10 x^{3} - 3 x) \div (- 2 x^{3} + 3 x)$

Step 1

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

$2 x^{3}$

$0 x^{2}$

$3 x$

$0$

$8 x^{5}$

$0 x^{4}$

$10 x^{3}$

$0 x^{2}$

$3 x$

$0$

Step 2

Divide the highest order term in the dividend $8 x^{5}$ by the highest order term in divisor $- 2 x^{3}$ .

$4 x^{2}$

$2 x^{3}$

$0 x^{2}$

$3 x$

$0$

$8 x^{5}$

$0 x^{4}$

$10 x^{3}$

$0 x^{2}$

$3 x$

$0$

Step 3

Multiply the new quotient term by the divisor.

$4 x^{2}$

$2 x^{3}$

$0 x^{2}$

$3 x$

$0$

$8 x^{5}$

$0 x^{4}$

$10 x^{3}$

$0 x^{2}$

$3 x$

$0$

$8 x^{5}$

$0$

$12 x^{3}$

$0$

Step 4

The expression needs to be subtracted from the dividend, so change all the signs in $8 x^{5} + 0 - 12 x^{3} + 0$

$4 x^{2}$

$2 x^{3}$

$0 x^{2}$

$3 x$

$0$

$8 x^{5}$

$0 x^{4}$

$10 x^{3}$

$0 x^{2}$

$3 x$

$0$

$8 x^{5}$

$0$

$12 x^{3}$

$0$

Step 5

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

$4 x^{2}$

$2 x^{3}$

$0 x^{2}$

$3 x$

$0$

$8 x^{5}$

$0 x^{4}$

$10 x^{3}$

$0 x^{2}$

$3 x$

$0$

$8 x^{5}$

$0$

$12 x^{3}$

$0$

$2 x^{3}$

$0$

Step 6

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

$4 x^{2}$

$2 x^{3}$

$0 x^{2}$

$3 x$

$0$

$8 x^{5}$

$0 x^{4}$

$10 x^{3}$

$0 x^{2}$

$3 x$

$0$

$8 x^{5}$

$0$

$12 x^{3}$

$0$

$2 x^{3}$

$0$

$3 x$

$0$

Step 7

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

$4 x^{2}$

$0 x$

$1$

$2 x^{3}$

$0 x^{2}$

$3 x$

$0$

$8 x^{5}$

$0 x^{4}$

$10 x^{3}$

$0 x^{2}$

$3 x$

$0$

$8 x^{5}$

$0$

$12 x^{3}$

$0$

$2 x^{3}$

$0$

$3 x$

$0$

Step 8

Multiply the new quotient term by the divisor.

$4 x^{2}$

$0 x$

$1$

$2 x^{3}$

$0 x^{2}$

$3 x$

$0$

$8 x^{5}$

$0 x^{4}$

$10 x^{3}$

$0 x^{2}$

$3 x$

$0$

$8 x^{5}$

$0$

$12 x^{3}$

$0$

$2 x^{3}$

$0$

$3 x$

$0$

$2 x^{3}$

$0$

$3 x$

$0$

Step 9

The expression needs to be subtracted from the dividend, so change all the signs in $2 x^{3} + 0 - 3 x + 0$

								-	$4 x^{2}$	+	$0 x$	-	$1$
-	$2 x^{3}$	+	$0 x^{2}$	+	$3 x$	+	$0$		$8 x^{5}$	+	$0 x^{4}$	-	$10 x^{3}$	+	$0 x^{2}$	-	$3 x$	+	$0$
								-	$8 x^{5}$	-	$0$	+	$12 x^{3}$	-	$0$
												+	$2 x^{3}$	+	$0$	-	$3 x$	+	$0$
												-	$2 x^{3}$	-	$0$	+	$3 x$	-	$0$

Step 10

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

								-	$4 x^{2}$	+	$0 x$	-	$1$
-	$2 x^{3}$	+	$0 x^{2}$	+	$3 x$	+	$0$		$8 x^{5}$	+	$0 x^{4}$	-	$10 x^{3}$	+	$0 x^{2}$	-	$3 x$	+	$0$
								-	$8 x^{5}$	-	$0$	+	$12 x^{3}$	-	$0$
												+	$2 x^{3}$	+	$0$	-	$3 x$	+	$0$
												-	$2 x^{3}$	-	$0$	+	$3 x$	-	$0$
																			$0$

Step 11

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

$- 4 x^{2} + 0 x - 1$