Algebra Examples

$4 x^{3} - 22 x^{2} + 20 x - 9$ divided by $2 x - 9$

Step 1

Write the problem as a mathematical expression.

$\frac{4 x^{3} - 22 x^{2} + 20 x - 9}{2 x - 9}$

Step 2

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

$2 x$

$9$

$4 x^{3}$

$22 x^{2}$

$20 x$

$9$

Step 3

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

					$2 x^{2}$
	$2 x$	-	$9$		$4 x^{3}$	-	$22 x^{2}$	+	$20 x$	-	$9$

Step 4

Multiply the new quotient term by the divisor.

				$2 x^{2}$
$2 x$	-	$9$		$4 x^{3}$	-	$22 x^{2}$	+	$20 x$	-	$9$
			+	$4 x^{3}$	-	$18 x^{2}$

Step 5

The expression needs to be subtracted from the dividend, so change all the signs in $4 x^{3} - 18 x^{2}$

				$2 x^{2}$
$2 x$	-	$9$		$4 x^{3}$	-	$22 x^{2}$	+	$20 x$	-	$9$
			-	$4 x^{3}$	+	$18 x^{2}$

Step 6

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

				$2 x^{2}$
$2 x$	-	$9$		$4 x^{3}$	-	$22 x^{2}$	+	$20 x$	-	$9$
			-	$4 x^{3}$	+	$18 x^{2}$
					-	$4 x^{2}$

Step 7

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

				$2 x^{2}$
$2 x$	-	$9$		$4 x^{3}$	-	$22 x^{2}$	+	$20 x$	-	$9$
			-	$4 x^{3}$	+	$18 x^{2}$
					-	$4 x^{2}$	+	$20 x$

Step 8

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

				$2 x^{2}$	-	$2 x$
$2 x$	-	$9$		$4 x^{3}$	-	$22 x^{2}$	+	$20 x$	-	$9$
			-	$4 x^{3}$	+	$18 x^{2}$
					-	$4 x^{2}$	+	$20 x$

Step 9

Multiply the new quotient term by the divisor.

				$2 x^{2}$	-	$2 x$
$2 x$	-	$9$		$4 x^{3}$	-	$22 x^{2}$	+	$20 x$	-	$9$
			-	$4 x^{3}$	+	$18 x^{2}$
					-	$4 x^{2}$	+	$20 x$
					-	$4 x^{2}$	+	$18 x$

Step 10

The expression needs to be subtracted from the dividend, so change all the signs in $- 4 x^{2} + 18 x$

				$2 x^{2}$	-	$2 x$
$2 x$	-	$9$		$4 x^{3}$	-	$22 x^{2}$	+	$20 x$	-	$9$
			-	$4 x^{3}$	+	$18 x^{2}$
					-	$4 x^{2}$	+	$20 x$
					+	$4 x^{2}$	-	$18 x$

Step 11

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

				$2 x^{2}$	-	$2 x$
$2 x$	-	$9$		$4 x^{3}$	-	$22 x^{2}$	+	$20 x$	-	$9$
			-	$4 x^{3}$	+	$18 x^{2}$
					-	$4 x^{2}$	+	$20 x$
					+	$4 x^{2}$	-	$18 x$
							+	$2 x$

Step 12

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

				$2 x^{2}$	-	$2 x$
$2 x$	-	$9$		$4 x^{3}$	-	$22 x^{2}$	+	$20 x$	-	$9$
			-	$4 x^{3}$	+	$18 x^{2}$
					-	$4 x^{2}$	+	$20 x$
					+	$4 x^{2}$	-	$18 x$
							+	$2 x$	-	$9$

Step 13

Divide the highest order term in the dividend $2 x$ by the highest order term in divisor $2 x$ .

				$2 x^{2}$	-	$2 x$	+	$1$
$2 x$	-	$9$		$4 x^{3}$	-	$22 x^{2}$	+	$20 x$	-	$9$
			-	$4 x^{3}$	+	$18 x^{2}$
					-	$4 x^{2}$	+	$20 x$
					+	$4 x^{2}$	-	$18 x$
							+	$2 x$	-	$9$

Step 14

Multiply the new quotient term by the divisor.

				$2 x^{2}$	-	$2 x$	+	$1$
$2 x$	-	$9$		$4 x^{3}$	-	$22 x^{2}$	+	$20 x$	-	$9$
			-	$4 x^{3}$	+	$18 x^{2}$
					-	$4 x^{2}$	+	$20 x$
					+	$4 x^{2}$	-	$18 x$
							+	$2 x$	-	$9$
							+	$2 x$	-	$9$

Step 15

The expression needs to be subtracted from the dividend, so change all the signs in $2 x - 9$

				$2 x^{2}$	-	$2 x$	+	$1$
$2 x$	-	$9$		$4 x^{3}$	-	$22 x^{2}$	+	$20 x$	-	$9$
			-	$4 x^{3}$	+	$18 x^{2}$
					-	$4 x^{2}$	+	$20 x$
					+	$4 x^{2}$	-	$18 x$
							+	$2 x$	-	$9$
							-	$2 x$	+	$9$

Step 16

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

				$2 x^{2}$	-	$2 x$	+	$1$
$2 x$	-	$9$		$4 x^{3}$	-	$22 x^{2}$	+	$20 x$	-	$9$
			-	$4 x^{3}$	+	$18 x^{2}$
					-	$4 x^{2}$	+	$20 x$
					+	$4 x^{2}$	-	$18 x$
							+	$2 x$	-	$9$
							-	$2 x$	+	$9$
										$0$

Step 17

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

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