Algebra Examples

$(k^{3} - 30 k - 18 - 4 k^{2}) \div (3 + k)$

Step 1

Expand $k^{3} - 30 k - 18 - 4 k^{2}$ .

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Step 1.1

Move $- 18$ .

$\frac{k^{3} - 30 k - 4 k^{2} - 18}{3 + k}$

Step 1.2

Move $- 30 k$ .

$\frac{k^{3} - 4 k^{2} - 30 k - 18}{3 + k}$

Step 2

Reorder $3$ and $k$ .

$\frac{k^{3} - 4 k^{2} - 30 k - 18}{k + 3}$

Step 3

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

$k$

$3$

$k^{3}$

$4 k^{2}$

$30 k$

$18$

Step 4

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

					$k^{2}$
	$k$	+	$3$		$k^{3}$	-	$4 k^{2}$	-	$30 k$	-	$18$

Step 5

Multiply the new quotient term by the divisor.

				$k^{2}$
$k$	+	$3$		$k^{3}$	-	$4 k^{2}$	-	$30 k$	-	$18$
			+	$k^{3}$	+	$3 k^{2}$

Step 6

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

				$k^{2}$
$k$	+	$3$		$k^{3}$	-	$4 k^{2}$	-	$30 k$	-	$18$
			-	$k^{3}$	-	$3 k^{2}$

Step 7

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

				$k^{2}$
$k$	+	$3$		$k^{3}$	-	$4 k^{2}$	-	$30 k$	-	$18$
			-	$k^{3}$	-	$3 k^{2}$
					-	$7 k^{2}$

Step 8

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

				$k^{2}$
$k$	+	$3$		$k^{3}$	-	$4 k^{2}$	-	$30 k$	-	$18$
			-	$k^{3}$	-	$3 k^{2}$
					-	$7 k^{2}$	-	$30 k$

Step 9

Divide the highest order term in the dividend $- 7 k^{2}$ by the highest order term in divisor $k$ .

				$k^{2}$	-	$7 k$
$k$	+	$3$		$k^{3}$	-	$4 k^{2}$	-	$30 k$	-	$18$
			-	$k^{3}$	-	$3 k^{2}$
					-	$7 k^{2}$	-	$30 k$

Step 10

Multiply the new quotient term by the divisor.

				$k^{2}$	-	$7 k$
$k$	+	$3$		$k^{3}$	-	$4 k^{2}$	-	$30 k$	-	$18$
			-	$k^{3}$	-	$3 k^{2}$
					-	$7 k^{2}$	-	$30 k$
					-	$7 k^{2}$	-	$21 k$

Step 11

The expression needs to be subtracted from the dividend, so change all the signs in $- 7 k^{2} - 21 k$

				$k^{2}$	-	$7 k$
$k$	+	$3$		$k^{3}$	-	$4 k^{2}$	-	$30 k$	-	$18$
			-	$k^{3}$	-	$3 k^{2}$
					-	$7 k^{2}$	-	$30 k$
					+	$7 k^{2}$	+	$21 k$

Step 12

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

				$k^{2}$	-	$7 k$
$k$	+	$3$		$k^{3}$	-	$4 k^{2}$	-	$30 k$	-	$18$
			-	$k^{3}$	-	$3 k^{2}$
					-	$7 k^{2}$	-	$30 k$
					+	$7 k^{2}$	+	$21 k$
							-	$9 k$

Step 13

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

				$k^{2}$	-	$7 k$
$k$	+	$3$		$k^{3}$	-	$4 k^{2}$	-	$30 k$	-	$18$
			-	$k^{3}$	-	$3 k^{2}$
					-	$7 k^{2}$	-	$30 k$
					+	$7 k^{2}$	+	$21 k$
							-	$9 k$	-	$18$

Step 14

Divide the highest order term in the dividend $- 9 k$ by the highest order term in divisor $k$ .

				$k^{2}$	-	$7 k$	-	$9$
$k$	+	$3$		$k^{3}$	-	$4 k^{2}$	-	$30 k$	-	$18$
			-	$k^{3}$	-	$3 k^{2}$
					-	$7 k^{2}$	-	$30 k$
					+	$7 k^{2}$	+	$21 k$
							-	$9 k$	-	$18$

Step 15

Multiply the new quotient term by the divisor.

				$k^{2}$	-	$7 k$	-	$9$
$k$	+	$3$		$k^{3}$	-	$4 k^{2}$	-	$30 k$	-	$18$
			-	$k^{3}$	-	$3 k^{2}$
					-	$7 k^{2}$	-	$30 k$
					+	$7 k^{2}$	+	$21 k$
							-	$9 k$	-	$18$
							-	$9 k$	-	$27$

Step 16

The expression needs to be subtracted from the dividend, so change all the signs in $- 9 k - 27$

				$k^{2}$	-	$7 k$	-	$9$
$k$	+	$3$		$k^{3}$	-	$4 k^{2}$	-	$30 k$	-	$18$
			-	$k^{3}$	-	$3 k^{2}$
					-	$7 k^{2}$	-	$30 k$
					+	$7 k^{2}$	+	$21 k$
							-	$9 k$	-	$18$
							+	$9 k$	+	$27$

Step 17

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

				$k^{2}$	-	$7 k$	-	$9$
$k$	+	$3$		$k^{3}$	-	$4 k^{2}$	-	$30 k$	-	$18$
			-	$k^{3}$	-	$3 k^{2}$
					-	$7 k^{2}$	-	$30 k$
					+	$7 k^{2}$	+	$21 k$
							-	$9 k$	-	$18$
							+	$9 k$	+	$27$
									+	$9$

Step 18

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

$k^{2} - 7 k - 9 + \frac{9}{k + 3}$