Algebra Examples

$(3 x^{4} - 2 x^{3} + 4 x - 5) \div (x^{2} + 4)$

Step 1

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

$x^{2}$

$0 x$

$4$

$3 x^{4}$

$2 x^{3}$

$0 x^{2}$

$4 x$

$5$

Step 2

Divide the highest order term in the dividend $3 x^{4}$ by the highest order term in divisor $x^{2}$ .

$3 x^{2}$

$x^{2}$

$0 x$

$4$

$3 x^{4}$

$2 x^{3}$

$0 x^{2}$

$4 x$

$5$

Step 3

Multiply the new quotient term by the divisor.

$3 x^{2}$

$x^{2}$

$0 x$

$4$

$3 x^{4}$

$2 x^{3}$

$0 x^{2}$

$4 x$

$5$

$3 x^{4}$

$0$

$12 x^{2}$

Step 4

The expression needs to be subtracted from the dividend, so change all the signs in $3 x^{4} + 0 + 12 x^{2}$

$3 x^{2}$

$x^{2}$

$0 x$

$4$

$3 x^{4}$

$2 x^{3}$

$0 x^{2}$

$4 x$

$5$

$3 x^{4}$

$0$

$12 x^{2}$

Step 5

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

						$3 x^{2}$
$x^{2}$	+	$0 x$	+	$4$		$3 x^{4}$	-	$2 x^{3}$	+	$0 x^{2}$	+	$4 x$	-	$5$
					-	$3 x^{4}$	-	$0$	-	$12 x^{2}$
							-	$2 x^{3}$	-	$12 x^{2}$

Step 6

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

$3 x^{2}$

$x^{2}$

$0 x$

$4$

$3 x^{4}$

$2 x^{3}$

$0 x^{2}$

$4 x$

$5$

$3 x^{4}$

$0$

$12 x^{2}$

$2 x^{3}$

$12 x^{2}$

$4 x$

Step 7

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

$3 x^{2}$

$2 x$

$x^{2}$

$0 x$

$4$

$3 x^{4}$

$2 x^{3}$

$0 x^{2}$

$4 x$

$5$

$3 x^{4}$

$0$

$12 x^{2}$

$2 x^{3}$

$12 x^{2}$

$4 x$

Step 8

Multiply the new quotient term by the divisor.

						$3 x^{2}$	-	$2 x$
$x^{2}$	+	$0 x$	+	$4$		$3 x^{4}$	-	$2 x^{3}$	+	$0 x^{2}$	+	$4 x$	-	$5$
					-	$3 x^{4}$	-	$0$	-	$12 x^{2}$
							-	$2 x^{3}$	-	$12 x^{2}$	+	$4 x$
							-	$2 x^{3}$	+	$0$	-	$8 x$

Step 9

The expression needs to be subtracted from the dividend, so change all the signs in $- 2 x^{3} + 0 - 8 x$

$3 x^{2}$

$2 x$

$x^{2}$

$0 x$

$4$

$3 x^{4}$

$2 x^{3}$

$0 x^{2}$

$4 x$

$5$

$3 x^{4}$

$0$

$12 x^{2}$

$2 x^{3}$

$12 x^{2}$

$4 x$

$2 x^{3}$

$0$

$8 x$

Step 10

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

$3 x^{2}$

$2 x$

$x^{2}$

$0 x$

$4$

$3 x^{4}$

$2 x^{3}$

$0 x^{2}$

$4 x$

$5$

$3 x^{4}$

$0$

$12 x^{2}$

$2 x^{3}$

$12 x^{2}$

$4 x$

$2 x^{3}$

$0$

$8 x$

$12 x^{2}$

$12 x$

Step 11

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

$3 x^{2}$

$2 x$

$x^{2}$

$0 x$

$4$

$3 x^{4}$

$2 x^{3}$

$0 x^{2}$

$4 x$

$5$

$3 x^{4}$

$0$

$12 x^{2}$

$2 x^{3}$

$12 x^{2}$

$4 x$

$2 x^{3}$

$0$

$8 x$

$12 x^{2}$

$12 x$

$5$

Step 12

Divide the highest order term in the dividend $- 12 x^{2}$ by the highest order term in divisor $x^{2}$ .

						$3 x^{2}$	-	$2 x$	-	$12$
$x^{2}$	+	$0 x$	+	$4$		$3 x^{4}$	-	$2 x^{3}$	+	$0 x^{2}$	+	$4 x$	-	$5$
					-	$3 x^{4}$	-	$0$	-	$12 x^{2}$
							-	$2 x^{3}$	-	$12 x^{2}$	+	$4 x$
							+	$2 x^{3}$	-	$0$	+	$8 x$
									-	$12 x^{2}$	+	$12 x$	-	$5$

Step 13

Multiply the new quotient term by the divisor.

						$3 x^{2}$	-	$2 x$	-	$12$
$x^{2}$	+	$0 x$	+	$4$		$3 x^{4}$	-	$2 x^{3}$	+	$0 x^{2}$	+	$4 x$	-	$5$
					-	$3 x^{4}$	-	$0$	-	$12 x^{2}$
							-	$2 x^{3}$	-	$12 x^{2}$	+	$4 x$
							+	$2 x^{3}$	-	$0$	+	$8 x$
									-	$12 x^{2}$	+	$12 x$	-	$5$
									-	$12 x^{2}$	+	$0$	-	$48$

Step 14

The expression needs to be subtracted from the dividend, so change all the signs in $- 12 x^{2} + 0 - 48$

						$3 x^{2}$	-	$2 x$	-	$12$
$x^{2}$	+	$0 x$	+	$4$		$3 x^{4}$	-	$2 x^{3}$	+	$0 x^{2}$	+	$4 x$	-	$5$
					-	$3 x^{4}$	-	$0$	-	$12 x^{2}$
							-	$2 x^{3}$	-	$12 x^{2}$	+	$4 x$
							+	$2 x^{3}$	-	$0$	+	$8 x$
									-	$12 x^{2}$	+	$12 x$	-	$5$
									+	$12 x^{2}$	-	$0$	+	$48$

Step 15

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

						$3 x^{2}$	-	$2 x$	-	$12$
$x^{2}$	+	$0 x$	+	$4$		$3 x^{4}$	-	$2 x^{3}$	+	$0 x^{2}$	+	$4 x$	-	$5$
					-	$3 x^{4}$	-	$0$	-	$12 x^{2}$
							-	$2 x^{3}$	-	$12 x^{2}$	+	$4 x$
							+	$2 x^{3}$	-	$0$	+	$8 x$
									-	$12 x^{2}$	+	$12 x$	-	$5$
									+	$12 x^{2}$	-	$0$	+	$48$
											+	$12 x$	+	$43$

Step 16

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

$3 x^{2} - 2 x - 12 + \frac{12 x + 43}{x^{2} + 4}$