Pre-Algebra Examples

$12 x^{2} - 64 x - 11$ ,

$x + 1$

Step 1

Divide the first expression by the second expression.

$\frac{12 x^{2} - 64 x - 11}{x + 1}$

Step 2

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

$0$ .

$x$

$1$

$12 x^{2}$

$64 x$

$11$

Step 3

Divide the highest order term in the dividend

$12 x^{2}$ by the highest order term in divisor

$x$ .

					$12 x$
	$x$	+	$1$		$12 x^{2}$	-	$64 x$	-	$11$

Step 4

Multiply the new quotient term by the divisor.

				$12 x$
$x$	+	$1$		$12 x^{2}$	-	$64 x$	-	$11$
			+	$12 x^{2}$	+	$12 x$

Step 5

The expression needs to be subtracted from the dividend, so change all the signs in

$12 x^{2} + 12 x$

				$12 x$
$x$	+	$1$		$12 x^{2}$	-	$64 x$	-	$11$
			-	$12 x^{2}$	-	$12 x$

Step 6

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

				$12 x$
$x$	+	$1$		$12 x^{2}$	-	$64 x$	-	$11$
			-	$12 x^{2}$	-	$12 x$
					-	$76 x$

Step 7

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

				$12 x$
$x$	+	$1$		$12 x^{2}$	-	$64 x$	-	$11$
			-	$12 x^{2}$	-	$12 x$
					-	$76 x$	-	$11$

Step 8

Divide the highest order term in the dividend

$- 76 x$ by the highest order term in divisor

$x$ .

				$12 x$	-	$76$
$x$	+	$1$		$12 x^{2}$	-	$64 x$	-	$11$
			-	$12 x^{2}$	-	$12 x$
					-	$76 x$	-	$11$

Step 9

Multiply the new quotient term by the divisor.

				$12 x$	-	$76$
$x$	+	$1$		$12 x^{2}$	-	$64 x$	-	$11$
			-	$12 x^{2}$	-	$12 x$
					-	$76 x$	-	$11$
					-	$76 x$	-	$76$

Step 10

The expression needs to be subtracted from the dividend, so change all the signs in

$- 76 x - 76$

				$12 x$	-	$76$
$x$	+	$1$		$12 x^{2}$	-	$64 x$	-	$11$
			-	$12 x^{2}$	-	$12 x$
					-	$76 x$	-	$11$
					+	$76 x$	+	$76$

Step 11

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

				$12 x$	-	$76$
$x$	+	$1$		$12 x^{2}$	-	$64 x$	-	$11$
			-	$12 x^{2}$	-	$12 x$
					-	$76 x$	-	$11$
					+	$76 x$	+	$76$
							+	$65$

Step 12

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

$12 x - 76 + \frac{65}{x + 1}$

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