Pre-Algebra Examples

$\frac{8 x^{3} + 33 x^{2} + 34 + x + 20}{x + 3}$

Step 1

Expand $8 x^{3} + 33 x^{2} + 34 + x + 20$ .

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Step 1.1

Move $34$ .

$\frac{8 x^{3} + 33 x^{2} + x + 34 + 20}{x + 3}$

Step 1.2

Add $34$ and $20$ .

$\frac{8 x^{3} + 33 x^{2} + x + 54}{x + 3}$

Step 2

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

$x$

$3$

$8 x^{3}$

$33 x^{2}$

$x$

$54$

Step 3

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

					$8 x^{2}$
	$x$	+	$3$		$8 x^{3}$	+	$33 x^{2}$	+	$x$	+	$54$

Step 4

Multiply the new quotient term by the divisor.

				$8 x^{2}$
$x$	+	$3$		$8 x^{3}$	+	$33 x^{2}$	+	$x$	+	$54$
			+	$8 x^{3}$	+	$24 x^{2}$

Step 5

The expression needs to be subtracted from the dividend, so change all the signs in $8 x^{3} + 24 x^{2}$

				$8 x^{2}$
$x$	+	$3$		$8 x^{3}$	+	$33 x^{2}$	+	$x$	+	$54$
			-	$8 x^{3}$	-	$24 x^{2}$

Step 6

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

				$8 x^{2}$
$x$	+	$3$		$8 x^{3}$	+	$33 x^{2}$	+	$x$	+	$54$
			-	$8 x^{3}$	-	$24 x^{2}$
					+	$9 x^{2}$

Step 7

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

				$8 x^{2}$
$x$	+	$3$		$8 x^{3}$	+	$33 x^{2}$	+	$x$	+	$54$
			-	$8 x^{3}$	-	$24 x^{2}$
					+	$9 x^{2}$	+	$x$

Step 8

Divide the highest order term in the dividend $9 x^{2}$ by the highest order term in divisor $x$ .

				$8 x^{2}$	+	$9 x$
$x$	+	$3$		$8 x^{3}$	+	$33 x^{2}$	+	$x$	+	$54$
			-	$8 x^{3}$	-	$24 x^{2}$
					+	$9 x^{2}$	+	$x$

Step 9

Multiply the new quotient term by the divisor.

				$8 x^{2}$	+	$9 x$
$x$	+	$3$		$8 x^{3}$	+	$33 x^{2}$	+	$x$	+	$54$
			-	$8 x^{3}$	-	$24 x^{2}$
					+	$9 x^{2}$	+	$x$
					+	$9 x^{2}$	+	$27 x$

Step 10

The expression needs to be subtracted from the dividend, so change all the signs in $9 x^{2} + 27 x$

				$8 x^{2}$	+	$9 x$
$x$	+	$3$		$8 x^{3}$	+	$33 x^{2}$	+	$x$	+	$54$
			-	$8 x^{3}$	-	$24 x^{2}$
					+	$9 x^{2}$	+	$x$
					-	$9 x^{2}$	-	$27 x$

Step 11

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

				$8 x^{2}$	+	$9 x$
$x$	+	$3$		$8 x^{3}$	+	$33 x^{2}$	+	$x$	+	$54$
			-	$8 x^{3}$	-	$24 x^{2}$
					+	$9 x^{2}$	+	$x$
					-	$9 x^{2}$	-	$27 x$
							-	$26 x$

Step 12

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

				$8 x^{2}$	+	$9 x$
$x$	+	$3$		$8 x^{3}$	+	$33 x^{2}$	+	$x$	+	$54$
			-	$8 x^{3}$	-	$24 x^{2}$
					+	$9 x^{2}$	+	$x$
					-	$9 x^{2}$	-	$27 x$
							-	$26 x$	+	$54$

Step 13

Divide the highest order term in the dividend $- 26 x$ by the highest order term in divisor $x$ .

				$8 x^{2}$	+	$9 x$	-	$26$
$x$	+	$3$		$8 x^{3}$	+	$33 x^{2}$	+	$x$	+	$54$
			-	$8 x^{3}$	-	$24 x^{2}$
					+	$9 x^{2}$	+	$x$
					-	$9 x^{2}$	-	$27 x$
							-	$26 x$	+	$54$

Step 14

Multiply the new quotient term by the divisor.

				$8 x^{2}$	+	$9 x$	-	$26$
$x$	+	$3$		$8 x^{3}$	+	$33 x^{2}$	+	$x$	+	$54$
			-	$8 x^{3}$	-	$24 x^{2}$
					+	$9 x^{2}$	+	$x$
					-	$9 x^{2}$	-	$27 x$
							-	$26 x$	+	$54$
							-	$26 x$	-	$78$

Step 15

The expression needs to be subtracted from the dividend, so change all the signs in $- 26 x - 78$

				$8 x^{2}$	+	$9 x$	-	$26$
$x$	+	$3$		$8 x^{3}$	+	$33 x^{2}$	+	$x$	+	$54$
			-	$8 x^{3}$	-	$24 x^{2}$
					+	$9 x^{2}$	+	$x$
					-	$9 x^{2}$	-	$27 x$
							-	$26 x$	+	$54$
							+	$26 x$	+	$78$

Step 16

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

				$8 x^{2}$	+	$9 x$	-	$26$
$x$	+	$3$		$8 x^{3}$	+	$33 x^{2}$	+	$x$	+	$54$
			-	$8 x^{3}$	-	$24 x^{2}$
					+	$9 x^{2}$	+	$x$
					-	$9 x^{2}$	-	$27 x$
							-	$26 x$	+	$54$
							+	$26 x$	+	$78$
									+	$132$

Step 17

The final answer is the quotient plus the remainder over the divisor.

$8 x^{2} + 9 x - 26 + \frac{132}{x + 3}$