Algebra Examples

$x^{3} - 11 x + 8$ , $x - 3$

Step 1

Divide the higher order polynomial by the other polynomial in order to find the remainder.

$\frac{x^{3} - 11 x + 8}{x - 3}$

Step 2

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

$x$

$3$

$x^{3}$

$0 x^{2}$

$11 x$

$8$

Step 3

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

					$x^{2}$
	$x$	-	$3$		$x^{3}$	+	$0 x^{2}$	-	$11 x$	+	$8$

Step 4

Multiply the new quotient term by the divisor.

				$x^{2}$
$x$	-	$3$		$x^{3}$	+	$0 x^{2}$	-	$11 x$	+	$8$
			+	$x^{3}$	-	$3 x^{2}$

Step 5

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

				$x^{2}$
$x$	-	$3$		$x^{3}$	+	$0 x^{2}$	-	$11 x$	+	$8$
			-	$x^{3}$	+	$3 x^{2}$

Step 6

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

				$x^{2}$
$x$	-	$3$		$x^{3}$	+	$0 x^{2}$	-	$11 x$	+	$8$
			-	$x^{3}$	+	$3 x^{2}$
					+	$3 x^{2}$

Step 7

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

				$x^{2}$
$x$	-	$3$		$x^{3}$	+	$0 x^{2}$	-	$11 x$	+	$8$
			-	$x^{3}$	+	$3 x^{2}$
					+	$3 x^{2}$	-	$11 x$

Step 8

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

				$x^{2}$	+	$3 x$
$x$	-	$3$		$x^{3}$	+	$0 x^{2}$	-	$11 x$	+	$8$
			-	$x^{3}$	+	$3 x^{2}$
					+	$3 x^{2}$	-	$11 x$

Step 9

Multiply the new quotient term by the divisor.

				$x^{2}$	+	$3 x$
$x$	-	$3$		$x^{3}$	+	$0 x^{2}$	-	$11 x$	+	$8$
			-	$x^{3}$	+	$3 x^{2}$
					+	$3 x^{2}$	-	$11 x$
					+	$3 x^{2}$	-	$9 x$

Step 10

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

				$x^{2}$	+	$3 x$
$x$	-	$3$		$x^{3}$	+	$0 x^{2}$	-	$11 x$	+	$8$
			-	$x^{3}$	+	$3 x^{2}$
					+	$3 x^{2}$	-	$11 x$
					-	$3 x^{2}$	+	$9 x$

Step 11

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

				$x^{2}$	+	$3 x$
$x$	-	$3$		$x^{3}$	+	$0 x^{2}$	-	$11 x$	+	$8$
			-	$x^{3}$	+	$3 x^{2}$
					+	$3 x^{2}$	-	$11 x$
					-	$3 x^{2}$	+	$9 x$
							-	$2 x$

Step 12

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

				$x^{2}$	+	$3 x$
$x$	-	$3$		$x^{3}$	+	$0 x^{2}$	-	$11 x$	+	$8$
			-	$x^{3}$	+	$3 x^{2}$
					+	$3 x^{2}$	-	$11 x$
					-	$3 x^{2}$	+	$9 x$
							-	$2 x$	+	$8$

Step 13

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

				$x^{2}$	+	$3 x$	-	$2$
$x$	-	$3$		$x^{3}$	+	$0 x^{2}$	-	$11 x$	+	$8$
			-	$x^{3}$	+	$3 x^{2}$
					+	$3 x^{2}$	-	$11 x$
					-	$3 x^{2}$	+	$9 x$
							-	$2 x$	+	$8$

Step 14

Multiply the new quotient term by the divisor.

				$x^{2}$	+	$3 x$	-	$2$
$x$	-	$3$		$x^{3}$	+	$0 x^{2}$	-	$11 x$	+	$8$
			-	$x^{3}$	+	$3 x^{2}$
					+	$3 x^{2}$	-	$11 x$
					-	$3 x^{2}$	+	$9 x$
							-	$2 x$	+	$8$
							-	$2 x$	+	$6$

Step 15

The expression needs to be subtracted from the dividend, so change all the signs in $- 2 x + 6$

				$x^{2}$	+	$3 x$	-	$2$
$x$	-	$3$		$x^{3}$	+	$0 x^{2}$	-	$11 x$	+	$8$
			-	$x^{3}$	+	$3 x^{2}$
					+	$3 x^{2}$	-	$11 x$
					-	$3 x^{2}$	+	$9 x$
							-	$2 x$	+	$8$
							+	$2 x$	-	$6$

Step 16

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

				$x^{2}$	+	$3 x$	-	$2$
$x$	-	$3$		$x^{3}$	+	$0 x^{2}$	-	$11 x$	+	$8$
			-	$x^{3}$	+	$3 x^{2}$
					+	$3 x^{2}$	-	$11 x$
					-	$3 x^{2}$	+	$9 x$
							-	$2 x$	+	$8$
							+	$2 x$	-	$6$
									+	$2$

Step 17

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

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

Step 18

The remainder is the part of the answer that is left after the division by $x - 3$ is complete.

$2$

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