Algebra Examples

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

Step 1

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

$x^{2}$

$2 x$

$1$

$4 x^{4}$

$2 x^{3}$

$x^{2}$

$5 x$

$8$

Step 2

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

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

Step 3

Multiply the new quotient term by the divisor.

$4 x^{2}$

$x^{2}$

$2 x$

$1$

$4 x^{4}$

$2 x^{3}$

$x^{2}$

$5 x$

$8$

$4 x^{4}$

$8 x^{3}$

$4 x^{2}$

Step 4

The expression needs to be subtracted from the dividend, so change all the signs in $4 x^{4} - 8 x^{3} - 4 x^{2}$

$4 x^{2}$

$x^{2}$

$2 x$

$1$

$4 x^{4}$

$2 x^{3}$

$x^{2}$

$5 x$

$8$

$4 x^{4}$

$8 x^{3}$

$4 x^{2}$

Step 5

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

$4 x^{2}$

$x^{2}$

$2 x$

$1$

$4 x^{4}$

$2 x^{3}$

$x^{2}$

$5 x$

$8$

$4 x^{4}$

$8 x^{3}$

$4 x^{2}$

$6 x^{3}$

$5 x^{2}$

Step 6

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

$4 x^{2}$

$x^{2}$

$2 x$

$1$

$4 x^{4}$

$2 x^{3}$

$x^{2}$

$5 x$

$8$

$4 x^{4}$

$8 x^{3}$

$4 x^{2}$

$6 x^{3}$

$5 x^{2}$

$5 x$

Step 7

Divide the highest order term in the dividend $6 x^{3}$ by the highest order term in divisor $x^{2}$ .

$4 x^{2}$

$6 x$

$x^{2}$

$2 x$

$1$

$4 x^{4}$

$2 x^{3}$

$x^{2}$

$5 x$

$8$

$4 x^{4}$

$8 x^{3}$

$4 x^{2}$

$6 x^{3}$

$5 x^{2}$

$5 x$

Step 8

Multiply the new quotient term by the divisor.

$4 x^{2}$

$6 x$

$x^{2}$

$2 x$

$1$

$4 x^{4}$

$2 x^{3}$

$x^{2}$

$5 x$

$8$

$4 x^{4}$

$8 x^{3}$

$4 x^{2}$

$6 x^{3}$

$5 x^{2}$

$5 x$

$6 x^{3}$

$12 x^{2}$

$6 x$

Step 9

The expression needs to be subtracted from the dividend, so change all the signs in $6 x^{3} - 12 x^{2} - 6 x$

$4 x^{2}$

$6 x$

$x^{2}$

$2 x$

$1$

$4 x^{4}$

$2 x^{3}$

$x^{2}$

$5 x$

$8$

$4 x^{4}$

$8 x^{3}$

$4 x^{2}$

$6 x^{3}$

$5 x^{2}$

$5 x$

$6 x^{3}$

$12 x^{2}$

$6 x$

Step 10

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

$4 x^{2}$

$6 x$

$x^{2}$

$2 x$

$1$

$4 x^{4}$

$2 x^{3}$

$x^{2}$

$5 x$

$8$

$4 x^{4}$

$8 x^{3}$

$4 x^{2}$

$6 x^{3}$

$5 x^{2}$

$5 x$

$6 x^{3}$

$12 x^{2}$

$6 x$

$17 x^{2}$

$x$

Step 11

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

$4 x^{2}$

$6 x$

$x^{2}$

$2 x$

$1$

$4 x^{4}$

$2 x^{3}$

$x^{2}$

$5 x$

$8$

$4 x^{4}$

$8 x^{3}$

$4 x^{2}$

$6 x^{3}$

$5 x^{2}$

$5 x$

$6 x^{3}$

$12 x^{2}$

$6 x$

$17 x^{2}$

$x$

$8$

Step 12

Divide the highest order term in the dividend $17 x^{2}$ by the highest order term in divisor $x^{2}$ .

$4 x^{2}$

$6 x$

$17$

$x^{2}$

$2 x$

$1$

$4 x^{4}$

$2 x^{3}$

$x^{2}$

$5 x$

$8$

$4 x^{4}$

$8 x^{3}$

$4 x^{2}$

$6 x^{3}$

$5 x^{2}$

$5 x$

$6 x^{3}$

$12 x^{2}$

$6 x$

$17 x^{2}$

$x$

$8$

Step 13

Multiply the new quotient term by the divisor.

$4 x^{2}$

$6 x$

$17$

$x^{2}$

$2 x$

$1$

$4 x^{4}$

$2 x^{3}$

$x^{2}$

$5 x$

$8$

$4 x^{4}$

$8 x^{3}$

$4 x^{2}$

$6 x^{3}$

$5 x^{2}$

$5 x$

$6 x^{3}$

$12 x^{2}$

$6 x$

$17 x^{2}$

$x$

$8$

$17 x^{2}$

$34 x$

$17$

Step 14

The expression needs to be subtracted from the dividend, so change all the signs in $17 x^{2} - 34 x - 17$

$4 x^{2}$

$6 x$

$17$

$x^{2}$

$2 x$

$1$

$4 x^{4}$

$2 x^{3}$

$x^{2}$

$5 x$

$8$

$4 x^{4}$

$8 x^{3}$

$4 x^{2}$

$6 x^{3}$

$5 x^{2}$

$5 x$

$6 x^{3}$

$12 x^{2}$

$6 x$

$17 x^{2}$

$x$

$8$

$17 x^{2}$

$34 x$

$17$

Step 15

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

$4 x^{2}$

$6 x$

$17$

$x^{2}$

$2 x$

$1$

$4 x^{4}$

$2 x^{3}$

$x^{2}$

$5 x$

$8$

$4 x^{4}$

$8 x^{3}$

$4 x^{2}$

$6 x^{3}$

$5 x^{2}$

$5 x$

$6 x^{3}$

$12 x^{2}$

$6 x$

$17 x^{2}$

$x$

$8$

$17 x^{2}$

$34 x$

$17$

$35 x$

$25$

Step 16

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

$4 x^{2} + 6 x + 17 + \frac{35 x + 25}{x^{2} - 2 x - 1}$