Algebra Examples

$(2 x^{4} + 6 x - 5) \div (x^{2} + 4)$

Step 1

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

$x^{2}$

$0 x$

$4$

$2 x^{4}$

$0 x^{3}$

$0 x^{2}$

$6 x$

$5$

Step 2

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

$2 x^{2}$

$x^{2}$

$0 x$

$4$

$2 x^{4}$

$0 x^{3}$

$0 x^{2}$

$6 x$

$5$

Step 3

Multiply the new quotient term by the divisor.

$2 x^{2}$

$x^{2}$

$0 x$

$4$

$2 x^{4}$

$0 x^{3}$

$0 x^{2}$

$6 x$

$5$

$2 x^{4}$

$0$

$8 x^{2}$

Step 4

The expression needs to be subtracted from the dividend, so change all the signs in $2 x^{4} + 0 + 8 x^{2}$

$2 x^{2}$

$x^{2}$

$0 x$

$4$

$2 x^{4}$

$0 x^{3}$

$0 x^{2}$

$6 x$

$5$

$2 x^{4}$

$0$

$8 x^{2}$

Step 5

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

$2 x^{2}$

$x^{2}$

$0 x$

$4$

$2 x^{4}$

$0 x^{3}$

$0 x^{2}$

$6 x$

$5$

$2 x^{4}$

$0$

$8 x^{2}$

Step 6

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

$2 x^{2}$

$x^{2}$

$0 x$

$4$

$2 x^{4}$

$0 x^{3}$

$0 x^{2}$

$6 x$

$5$

$2 x^{4}$

$0$

$8 x^{2}$

$6 x$

$5$

Step 7

Divide the highest order term in the dividend $- 8 x^{2}$ by the highest order term in divisor $x^{2}$ .

$2 x^{2}$

$0 x$

$8$

$x^{2}$

$0 x$

$4$

$2 x^{4}$

$0 x^{3}$

$0 x^{2}$

$6 x$

$5$

$2 x^{4}$

$0$

$8 x^{2}$

$6 x$

$5$

Step 8

Multiply the new quotient term by the divisor.

						$2 x^{2}$	+	$0 x$	-	$8$
$x^{2}$	+	$0 x$	+	$4$		$2 x^{4}$	+	$0 x^{3}$	+	$0 x^{2}$	+	$6 x$	-	$5$
					-	$2 x^{4}$	-	$0$	-	$8 x^{2}$
									-	$8 x^{2}$	+	$6 x$	-	$5$
									-	$8 x^{2}$	+	$0$	-	$32$

Step 9

The expression needs to be subtracted from the dividend, so change all the signs in $- 8 x^{2} + 0 - 32$

						$2 x^{2}$	+	$0 x$	-	$8$
$x^{2}$	+	$0 x$	+	$4$		$2 x^{4}$	+	$0 x^{3}$	+	$0 x^{2}$	+	$6 x$	-	$5$
					-	$2 x^{4}$	-	$0$	-	$8 x^{2}$
									-	$8 x^{2}$	+	$6 x$	-	$5$
									+	$8 x^{2}$	-	$0$	+	$32$

Step 10

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

$2 x^{2}$

$0 x$

$8$

$x^{2}$

$0 x$

$4$

$2 x^{4}$

$0 x^{3}$

$0 x^{2}$

$6 x$

$5$

$2 x^{4}$

$0$

$8 x^{2}$

$6 x$

$5$

$8 x^{2}$

$0$

$32$

$6 x$

$27$

Step 11

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

$2 x^{2} - 8 + \frac{6 x + 27}{x^{2} + 4}$