Divide Using Long Polynomial Division Use the long division method to find the result when 2x^3+13x^2+20x+9 is divided by 2x+9

Use the long division method to find the result when $2 x^{3} + 13 x^{2} + 20 x + 9$ is divided by $2 x + 9$

Step 1

Write the problem as a mathematical expression.

Use the long division method to find the result when $\frac{2 x^{3} + 13 x^{2} + 20 x + 9}{2 x + 9}$

Step 2

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

$2 x$

$9$

$2 x^{3}$

$13 x^{2}$

$20 x$

$9$

Step 3

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

					$x^{2}$
	$2 x$	+	$9$		$2 x^{3}$	+	$13 x^{2}$	+	$20 x$	+	$9$

Step 4

Multiply the new quotient term by the divisor.

				$x^{2}$
$2 x$	+	$9$		$2 x^{3}$	+	$13 x^{2}$	+	$20 x$	+	$9$
			+	$2 x^{3}$	+	$9 x^{2}$

Step 5

The expression needs to be subtracted from the dividend, so change all the signs in $2 x^{3} + 9 x^{2}$

				$x^{2}$
$2 x$	+	$9$		$2 x^{3}$	+	$13 x^{2}$	+	$20 x$	+	$9$
			-	$2 x^{3}$	-	$9 x^{2}$

Step 6

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

				$x^{2}$
$2 x$	+	$9$		$2 x^{3}$	+	$13 x^{2}$	+	$20 x$	+	$9$
			-	$2 x^{3}$	-	$9 x^{2}$
					+	$4 x^{2}$

Step 7

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

				$x^{2}$
$2 x$	+	$9$		$2 x^{3}$	+	$13 x^{2}$	+	$20 x$	+	$9$
			-	$2 x^{3}$	-	$9 x^{2}$
					+	$4 x^{2}$	+	$20 x$

Step 8

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

				$x^{2}$	+	$2 x$
$2 x$	+	$9$		$2 x^{3}$	+	$13 x^{2}$	+	$20 x$	+	$9$
			-	$2 x^{3}$	-	$9 x^{2}$
					+	$4 x^{2}$	+	$20 x$

Step 9

Multiply the new quotient term by the divisor.

				$x^{2}$	+	$2 x$
$2 x$	+	$9$		$2 x^{3}$	+	$13 x^{2}$	+	$20 x$	+	$9$
			-	$2 x^{3}$	-	$9 x^{2}$
					+	$4 x^{2}$	+	$20 x$
					+	$4 x^{2}$	+	$18 x$

Step 10

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

				$x^{2}$	+	$2 x$
$2 x$	+	$9$		$2 x^{3}$	+	$13 x^{2}$	+	$20 x$	+	$9$
			-	$2 x^{3}$	-	$9 x^{2}$
					+	$4 x^{2}$	+	$20 x$
					-	$4 x^{2}$	-	$18 x$

Step 11

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

				$x^{2}$	+	$2 x$
$2 x$	+	$9$		$2 x^{3}$	+	$13 x^{2}$	+	$20 x$	+	$9$
			-	$2 x^{3}$	-	$9 x^{2}$
					+	$4 x^{2}$	+	$20 x$
					-	$4 x^{2}$	-	$18 x$
							+	$2 x$

Step 12

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

				$x^{2}$	+	$2 x$
$2 x$	+	$9$		$2 x^{3}$	+	$13 x^{2}$	+	$20 x$	+	$9$
			-	$2 x^{3}$	-	$9 x^{2}$
					+	$4 x^{2}$	+	$20 x$
					-	$4 x^{2}$	-	$18 x$
							+	$2 x$	+	$9$

Step 13

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

				$x^{2}$	+	$2 x$	+	$1$
$2 x$	+	$9$		$2 x^{3}$	+	$13 x^{2}$	+	$20 x$	+	$9$
			-	$2 x^{3}$	-	$9 x^{2}$
					+	$4 x^{2}$	+	$20 x$
					-	$4 x^{2}$	-	$18 x$
							+	$2 x$	+	$9$

Step 14

Multiply the new quotient term by the divisor.

				$x^{2}$	+	$2 x$	+	$1$
$2 x$	+	$9$		$2 x^{3}$	+	$13 x^{2}$	+	$20 x$	+	$9$
			-	$2 x^{3}$	-	$9 x^{2}$
					+	$4 x^{2}$	+	$20 x$
					-	$4 x^{2}$	-	$18 x$
							+	$2 x$	+	$9$
							+	$2 x$	+	$9$

Step 15

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

				$x^{2}$	+	$2 x$	+	$1$
$2 x$	+	$9$		$2 x^{3}$	+	$13 x^{2}$	+	$20 x$	+	$9$
			-	$2 x^{3}$	-	$9 x^{2}$
					+	$4 x^{2}$	+	$20 x$
					-	$4 x^{2}$	-	$18 x$
							+	$2 x$	+	$9$
							-	$2 x$	-	$9$

Step 16

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

				$x^{2}$	+	$2 x$	+	$1$
$2 x$	+	$9$		$2 x^{3}$	+	$13 x^{2}$	+	$20 x$	+	$9$
			-	$2 x^{3}$	-	$9 x^{2}$
					+	$4 x^{2}$	+	$20 x$
					-	$4 x^{2}$	-	$18 x$
							+	$2 x$	+	$9$
							-	$2 x$	-	$9$
										$0$

Step 17

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

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

Divide Using Long Polynomial Division Use the long division method to find the result when 2x^3+13x^2+20x+9 is divided by 2x+9

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