Algebra Examples

$(11 x^{2} + 2 x^{3} - 20) \div (x^{2} + x - 2)$

Step 1

To calculate the remainder, first divide the polynomials.

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Step 1.1

Reorder $11 x^{2}$ and $2 x^{3}$ .

$\frac{2 x^{3} + 11 x^{2} - 20}{x^{2} + x - 2}$

Step 1.2

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

$x^{2}$

$x$

$2$

$2 x^{3}$

$11 x^{2}$

$0 x$

$20$

Step 1.3

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

$2 x$

$x^{2}$

$x$

$2$

$2 x^{3}$

$11 x^{2}$

$0 x$

$20$

Step 1.4

Multiply the new quotient term by the divisor.

$2 x$

$x^{2}$

$x$

$2$

$2 x^{3}$

$11 x^{2}$

$0 x$

$20$

$2 x^{3}$

$2 x^{2}$

$4 x$

Step 1.5

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

$2 x$

$x^{2}$

$x$

$2$

$2 x^{3}$

$11 x^{2}$

$0 x$

$20$

$2 x^{3}$

$2 x^{2}$

$4 x$

Step 1.6

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

$2 x$

$x^{2}$

$x$

$2$

$2 x^{3}$

$11 x^{2}$

$0 x$

$20$

$2 x^{3}$

$2 x^{2}$

$4 x$

$9 x^{2}$

$4 x$

Step 1.7

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

$2 x$

$x^{2}$

$x$

$2$

$2 x^{3}$

$11 x^{2}$

$0 x$

$20$

$2 x^{3}$

$2 x^{2}$

$4 x$

$9 x^{2}$

$4 x$

$20$

Step 1.8

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

$2 x$

$9$

$x^{2}$

$x$

$2$

$2 x^{3}$

$11 x^{2}$

$0 x$

$20$

$2 x^{3}$

$2 x^{2}$

$4 x$

$9 x^{2}$

$4 x$

$20$

Step 1.9

Multiply the new quotient term by the divisor.

$2 x$

$9$

$x^{2}$

$x$

$2$

$2 x^{3}$

$11 x^{2}$

$0 x$

$20$

$2 x^{3}$

$2 x^{2}$

$4 x$

$9 x^{2}$

$4 x$

$20$

$9 x^{2}$

$9 x$

$18$

Step 1.10

The expression needs to be subtracted from the dividend, so change all the signs in $9 x^{2} + 9 x - 18$

$2 x$

$9$

$x^{2}$

$x$

$2$

$2 x^{3}$

$11 x^{2}$

$0 x$

$20$

$2 x^{3}$

$2 x^{2}$

$4 x$

$9 x^{2}$

$4 x$

$20$

$9 x^{2}$

$9 x$

$18$

Step 1.11

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

						$2 x$	+	$9$
$x^{2}$	+	$x$	-	$2$		$2 x^{3}$	+	$11 x^{2}$	+	$0 x$	-	$20$
					-	$2 x^{3}$	-	$2 x^{2}$	+	$4 x$
							+	$9 x^{2}$	+	$4 x$	-	$20$
							-	$9 x^{2}$	-	$9 x$	+	$18$
									-	$5 x$	-	$2$

Step 1.12

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

$2 x + 9 + \frac{- 5 x - 2}{x^{2} + x - 2}$

Step 2

Since the last term in the resulting expression is a fraction, the numerator of the fraction is the remainder.

$- 5 x - 2$