Algebra Examples

$(- 5 k^{2} + k^{3} + 8 k + 4) \div (- 1 + k)$

Step 1

Reorder $- 5 k^{2}$ and $k^{3}$ .

$\frac{k^{3} - 5 k^{2} + 8 k + 4}{- 1 + k}$

Step 2

Reorder $- 1$ and $k$ .

$\frac{k^{3} - 5 k^{2} + 8 k + 4}{k - 1}$

Step 3

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

$k$

$1$

$k^{3}$

$5 k^{2}$

$8 k$

$4$

Step 4

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

					$k^{2}$
	$k$	-	$1$		$k^{3}$	-	$5 k^{2}$	+	$8 k$	+	$4$

Step 5

Multiply the new quotient term by the divisor.

				$k^{2}$
$k$	-	$1$		$k^{3}$	-	$5 k^{2}$	+	$8 k$	+	$4$
			+	$k^{3}$	-	$k^{2}$

Step 6

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

				$k^{2}$
$k$	-	$1$		$k^{3}$	-	$5 k^{2}$	+	$8 k$	+	$4$
			-	$k^{3}$	+	$k^{2}$

Step 7

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

				$k^{2}$
$k$	-	$1$		$k^{3}$	-	$5 k^{2}$	+	$8 k$	+	$4$
			-	$k^{3}$	+	$k^{2}$
					-	$4 k^{2}$

Step 8

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

				$k^{2}$
$k$	-	$1$		$k^{3}$	-	$5 k^{2}$	+	$8 k$	+	$4$
			-	$k^{3}$	+	$k^{2}$
					-	$4 k^{2}$	+	$8 k$

Step 9

Divide the highest order term in the dividend $- 4 k^{2}$ by the highest order term in divisor $k$ .

				$k^{2}$	-	$4 k$
$k$	-	$1$		$k^{3}$	-	$5 k^{2}$	+	$8 k$	+	$4$
			-	$k^{3}$	+	$k^{2}$
					-	$4 k^{2}$	+	$8 k$

Step 10

Multiply the new quotient term by the divisor.

				$k^{2}$	-	$4 k$
$k$	-	$1$		$k^{3}$	-	$5 k^{2}$	+	$8 k$	+	$4$
			-	$k^{3}$	+	$k^{2}$
					-	$4 k^{2}$	+	$8 k$
					-	$4 k^{2}$	+	$4 k$

Step 11

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

				$k^{2}$	-	$4 k$
$k$	-	$1$		$k^{3}$	-	$5 k^{2}$	+	$8 k$	+	$4$
			-	$k^{3}$	+	$k^{2}$
					-	$4 k^{2}$	+	$8 k$
					+	$4 k^{2}$	-	$4 k$

Step 12

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

				$k^{2}$	-	$4 k$
$k$	-	$1$		$k^{3}$	-	$5 k^{2}$	+	$8 k$	+	$4$
			-	$k^{3}$	+	$k^{2}$
					-	$4 k^{2}$	+	$8 k$
					+	$4 k^{2}$	-	$4 k$
							+	$4 k$

Step 13

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

				$k^{2}$	-	$4 k$
$k$	-	$1$		$k^{3}$	-	$5 k^{2}$	+	$8 k$	+	$4$
			-	$k^{3}$	+	$k^{2}$
					-	$4 k^{2}$	+	$8 k$
					+	$4 k^{2}$	-	$4 k$
							+	$4 k$	+	$4$

Step 14

Divide the highest order term in the dividend $4 k$ by the highest order term in divisor $k$ .

				$k^{2}$	-	$4 k$	+	$4$
$k$	-	$1$		$k^{3}$	-	$5 k^{2}$	+	$8 k$	+	$4$
			-	$k^{3}$	+	$k^{2}$
					-	$4 k^{2}$	+	$8 k$
					+	$4 k^{2}$	-	$4 k$
							+	$4 k$	+	$4$

Step 15

Multiply the new quotient term by the divisor.

				$k^{2}$	-	$4 k$	+	$4$
$k$	-	$1$		$k^{3}$	-	$5 k^{2}$	+	$8 k$	+	$4$
			-	$k^{3}$	+	$k^{2}$
					-	$4 k^{2}$	+	$8 k$
					+	$4 k^{2}$	-	$4 k$
							+	$4 k$	+	$4$
							+	$4 k$	-	$4$

Step 16

The expression needs to be subtracted from the dividend, so change all the signs in $4 k - 4$

				$k^{2}$	-	$4 k$	+	$4$
$k$	-	$1$		$k^{3}$	-	$5 k^{2}$	+	$8 k$	+	$4$
			-	$k^{3}$	+	$k^{2}$
					-	$4 k^{2}$	+	$8 k$
					+	$4 k^{2}$	-	$4 k$
							+	$4 k$	+	$4$
							-	$4 k$	+	$4$

Step 17

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

				$k^{2}$	-	$4 k$	+	$4$
$k$	-	$1$		$k^{3}$	-	$5 k^{2}$	+	$8 k$	+	$4$
			-	$k^{3}$	+	$k^{2}$
					-	$4 k^{2}$	+	$8 k$
					+	$4 k^{2}$	-	$4 k$
							+	$4 k$	+	$4$
							-	$4 k$	+	$4$
									+	$8$

Step 18

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

$k^{2} - 4 k + 4 + \frac{8}{k - 1}$