Precalculus Examples

$\frac{6 x^{3} + 10 x^{2} + x + 8}{2 x^{2} + 1}$

Step 1

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

$2 x^{2}$

$0 x$

$1$

$6 x^{3}$

$10 x^{2}$

$x$

$8$

Step 2

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

$3 x$

$2 x^{2}$

$0 x$

$1$

$6 x^{3}$

$10 x^{2}$

$x$

$8$

Step 3

Multiply the new quotient term by the divisor.

$3 x$

$2 x^{2}$

$0 x$

$1$

$6 x^{3}$

$10 x^{2}$

$x$

$8$

$6 x^{3}$

$0$

$3 x$

Step 4

The expression needs to be subtracted from the dividend, so change all the signs in $6 x^{3} + 0 + 3 x$

$3 x$

$2 x^{2}$

$0 x$

$1$

$6 x^{3}$

$10 x^{2}$

$x$

$8$

$6 x^{3}$

$0$

$3 x$

Step 5

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

$3 x$

$2 x^{2}$

$0 x$

$1$

$6 x^{3}$

$10 x^{2}$

$x$

$8$

$6 x^{3}$

$0$

$3 x$

$10 x^{2}$

$2 x$

Step 6

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

$3 x$

$2 x^{2}$

$0 x$

$1$

$6 x^{3}$

$10 x^{2}$

$x$

$8$

$6 x^{3}$

$0$

$3 x$

$10 x^{2}$

$2 x$

$8$

Step 7

Divide the highest order term in the dividend $10 x^{2}$ by the highest order term in divisor $2 x^{2}$ .

$3 x$

$5$

$2 x^{2}$

$0 x$

$1$

$6 x^{3}$

$10 x^{2}$

$x$

$8$

$6 x^{3}$

$0$

$3 x$

$10 x^{2}$

$2 x$

$8$

Step 8

Multiply the new quotient term by the divisor.

$3 x$

$5$

$2 x^{2}$

$0 x$

$1$

$6 x^{3}$

$10 x^{2}$

$x$

$8$

$6 x^{3}$

$0$

$3 x$

$10 x^{2}$

$2 x$

$8$

$10 x^{2}$

$0$

$5$

Step 9

The expression needs to be subtracted from the dividend, so change all the signs in $10 x^{2} + 0 + 5$

						$3 x$	+	$5$
$2 x^{2}$	+	$0 x$	+	$1$		$6 x^{3}$	+	$10 x^{2}$	+	$x$	+	$8$
					-	$6 x^{3}$	-	$0$	-	$3 x$
							+	$10 x^{2}$	-	$2 x$	+	$8$
							-	$10 x^{2}$	-	$0$	-	$5$

Step 10

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

						$3 x$	+	$5$
$2 x^{2}$	+	$0 x$	+	$1$		$6 x^{3}$	+	$10 x^{2}$	+	$x$	+	$8$
					-	$6 x^{3}$	-	$0$	-	$3 x$
							+	$10 x^{2}$	-	$2 x$	+	$8$
							-	$10 x^{2}$	-	$0$	-	$5$
									-	$2 x$	+	$3$

Step 11

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

$3 x + 5 + \frac{- 2 x + 3}{2 x^{2} + 1}$