Pre-Algebra Examples

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

Step 1

Expand $2 x - 2 + 4 x^{3}$ .

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Step 1.1

Move $- 2$ .

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

Step 1.2

Reorder $2 x$ and $4 x^{3}$ .

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

Step 2

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

$x$

$2$

$4 x^{3}$

$0 x^{2}$

$2 x$

$2$

Step 3

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

					$4 x^{2}$
	$x$	+	$2$		$4 x^{3}$	+	$0 x^{2}$	+	$2 x$	-	$2$

Step 4

Multiply the new quotient term by the divisor.

				$4 x^{2}$
$x$	+	$2$		$4 x^{3}$	+	$0 x^{2}$	+	$2 x$	-	$2$
			+	$4 x^{3}$	+	$8 x^{2}$

Step 5

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

				$4 x^{2}$
$x$	+	$2$		$4 x^{3}$	+	$0 x^{2}$	+	$2 x$	-	$2$
			-	$4 x^{3}$	-	$8 x^{2}$

Step 6

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

				$4 x^{2}$
$x$	+	$2$		$4 x^{3}$	+	$0 x^{2}$	+	$2 x$	-	$2$
			-	$4 x^{3}$	-	$8 x^{2}$
					-	$8 x^{2}$

Step 7

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

				$4 x^{2}$
$x$	+	$2$		$4 x^{3}$	+	$0 x^{2}$	+	$2 x$	-	$2$
			-	$4 x^{3}$	-	$8 x^{2}$
					-	$8 x^{2}$	+	$2 x$

Step 8

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

				$4 x^{2}$	-	$8 x$
$x$	+	$2$		$4 x^{3}$	+	$0 x^{2}$	+	$2 x$	-	$2$
			-	$4 x^{3}$	-	$8 x^{2}$
					-	$8 x^{2}$	+	$2 x$

Step 9

Multiply the new quotient term by the divisor.

				$4 x^{2}$	-	$8 x$
$x$	+	$2$		$4 x^{3}$	+	$0 x^{2}$	+	$2 x$	-	$2$
			-	$4 x^{3}$	-	$8 x^{2}$
					-	$8 x^{2}$	+	$2 x$
					-	$8 x^{2}$	-	$16 x$

Step 10

The expression needs to be subtracted from the dividend, so change all the signs in $- 8 x^{2} - 16 x$

				$4 x^{2}$	-	$8 x$
$x$	+	$2$		$4 x^{3}$	+	$0 x^{2}$	+	$2 x$	-	$2$
			-	$4 x^{3}$	-	$8 x^{2}$
					-	$8 x^{2}$	+	$2 x$
					+	$8 x^{2}$	+	$16 x$

Step 11

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

				$4 x^{2}$	-	$8 x$
$x$	+	$2$		$4 x^{3}$	+	$0 x^{2}$	+	$2 x$	-	$2$
			-	$4 x^{3}$	-	$8 x^{2}$
					-	$8 x^{2}$	+	$2 x$
					+	$8 x^{2}$	+	$16 x$
							+	$18 x$

Step 12

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

				$4 x^{2}$	-	$8 x$
$x$	+	$2$		$4 x^{3}$	+	$0 x^{2}$	+	$2 x$	-	$2$
			-	$4 x^{3}$	-	$8 x^{2}$
					-	$8 x^{2}$	+	$2 x$
					+	$8 x^{2}$	+	$16 x$
							+	$18 x$	-	$2$

Step 13

Divide the highest order term in the dividend $18 x$ by the highest order term in divisor $x$ .

				$4 x^{2}$	-	$8 x$	+	$18$
$x$	+	$2$		$4 x^{3}$	+	$0 x^{2}$	+	$2 x$	-	$2$
			-	$4 x^{3}$	-	$8 x^{2}$
					-	$8 x^{2}$	+	$2 x$
					+	$8 x^{2}$	+	$16 x$
							+	$18 x$	-	$2$

Step 14

Multiply the new quotient term by the divisor.

				$4 x^{2}$	-	$8 x$	+	$18$
$x$	+	$2$		$4 x^{3}$	+	$0 x^{2}$	+	$2 x$	-	$2$
			-	$4 x^{3}$	-	$8 x^{2}$
					-	$8 x^{2}$	+	$2 x$
					+	$8 x^{2}$	+	$16 x$
							+	$18 x$	-	$2$
							+	$18 x$	+	$36$

Step 15

The expression needs to be subtracted from the dividend, so change all the signs in $18 x + 36$

				$4 x^{2}$	-	$8 x$	+	$18$
$x$	+	$2$		$4 x^{3}$	+	$0 x^{2}$	+	$2 x$	-	$2$
			-	$4 x^{3}$	-	$8 x^{2}$
					-	$8 x^{2}$	+	$2 x$
					+	$8 x^{2}$	+	$16 x$
							+	$18 x$	-	$2$
							-	$18 x$	-	$36$

Step 16

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

				$4 x^{2}$	-	$8 x$	+	$18$
$x$	+	$2$		$4 x^{3}$	+	$0 x^{2}$	+	$2 x$	-	$2$
			-	$4 x^{3}$	-	$8 x^{2}$
					-	$8 x^{2}$	+	$2 x$
					+	$8 x^{2}$	+	$16 x$
							+	$18 x$	-	$2$
							-	$18 x$	-	$36$
									-	$38$

Step 17

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

$4 x^{2} - 8 x + 18 - \frac{38}{x + 2}$