Precalculus Examples

$\frac{27 x^{4} + 21 x^{3} + 6 x^{2}}{3 x^{2} + 1}$

Step 1

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

$3 x^{2}$

$0 x$

$1$

$27 x^{4}$

$21 x^{3}$

$6 x^{2}$

$0 x$

$0$

Step 2

Divide the highest order term in the dividend $27 x^{4}$ by the highest order term in divisor $3 x^{2}$ .

$9 x^{2}$

$3 x^{2}$

$0 x$

$1$

$27 x^{4}$

$21 x^{3}$

$6 x^{2}$

$0 x$

$0$

Step 3

Multiply the new quotient term by the divisor.

$9 x^{2}$

$3 x^{2}$

$0 x$

$1$

$27 x^{4}$

$21 x^{3}$

$6 x^{2}$

$0 x$

$0$

$27 x^{4}$

$0$

$9 x^{2}$

Step 4

The expression needs to be subtracted from the dividend, so change all the signs in $27 x^{4} + 0 + 9 x^{2}$

$9 x^{2}$

$3 x^{2}$

$0 x$

$1$

$27 x^{4}$

$21 x^{3}$

$6 x^{2}$

$0 x$

$0$

$27 x^{4}$

$0$

$9 x^{2}$

Step 5

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

$9 x^{2}$

$3 x^{2}$

$0 x$

$1$

$27 x^{4}$

$21 x^{3}$

$6 x^{2}$

$0 x$

$0$

$27 x^{4}$

$0$

$9 x^{2}$

$21 x^{3}$

$3 x^{2}$

Step 6

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

$9 x^{2}$

$3 x^{2}$

$0 x$

$1$

$27 x^{4}$

$21 x^{3}$

$6 x^{2}$

$0 x$

$0$

$27 x^{4}$

$0$

$9 x^{2}$

$21 x^{3}$

$3 x^{2}$

$0 x$

Step 7

Divide the highest order term in the dividend $21 x^{3}$ by the highest order term in divisor $3 x^{2}$ .

$9 x^{2}$

$7 x$

$3 x^{2}$

$0 x$

$1$

$27 x^{4}$

$21 x^{3}$

$6 x^{2}$

$0 x$

$0$

$27 x^{4}$

$0$

$9 x^{2}$

$21 x^{3}$

$3 x^{2}$

$0 x$

Step 8

Multiply the new quotient term by the divisor.

$9 x^{2}$

$7 x$

$3 x^{2}$

$0 x$

$1$

$27 x^{4}$

$21 x^{3}$

$6 x^{2}$

$0 x$

$0$

$27 x^{4}$

$0$

$9 x^{2}$

$21 x^{3}$

$3 x^{2}$

$0 x$

$21 x^{3}$

$0$

$7 x$

Step 9

The expression needs to be subtracted from the dividend, so change all the signs in $21 x^{3} + 0 + 7 x$

$9 x^{2}$

$7 x$

$3 x^{2}$

$0 x$

$1$

$27 x^{4}$

$21 x^{3}$

$6 x^{2}$

$0 x$

$0$

$27 x^{4}$

$0$

$9 x^{2}$

$21 x^{3}$

$3 x^{2}$

$0 x$

$21 x^{3}$

$0$

$7 x$

Step 10

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

$9 x^{2}$

$7 x$

$3 x^{2}$

$0 x$

$1$

$27 x^{4}$

$21 x^{3}$

$6 x^{2}$

$0 x$

$0$

$27 x^{4}$

$0$

$9 x^{2}$

$21 x^{3}$

$3 x^{2}$

$0 x$

$21 x^{3}$

$0$

$7 x$

$3 x^{2}$

$7 x$

Step 11

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

$9 x^{2}$

$7 x$

$3 x^{2}$

$0 x$

$1$

$27 x^{4}$

$21 x^{3}$

$6 x^{2}$

$0 x$

$0$

$27 x^{4}$

$0$

$9 x^{2}$

$21 x^{3}$

$3 x^{2}$

$0 x$

$21 x^{3}$

$0$

$7 x$

$3 x^{2}$

$7 x$

$0$

Step 12

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

$9 x^{2}$

$7 x$

$1$

$3 x^{2}$

$0 x$

$1$

$27 x^{4}$

$21 x^{3}$

$6 x^{2}$

$0 x$

$0$

$27 x^{4}$

$0$

$9 x^{2}$

$21 x^{3}$

$3 x^{2}$

$0 x$

$21 x^{3}$

$0$

$7 x$

$3 x^{2}$

$7 x$

$0$

Step 13

Multiply the new quotient term by the divisor.

						$9 x^{2}$	+	$7 x$	-	$1$
$3 x^{2}$	+	$0 x$	+	$1$		$27 x^{4}$	+	$21 x^{3}$	+	$6 x^{2}$	+	$0 x$	+	$0$
					-	$27 x^{4}$	-	$0$	-	$9 x^{2}$
							+	$21 x^{3}$	-	$3 x^{2}$	+	$0 x$
							-	$21 x^{3}$	-	$0$	-	$7 x$
									-	$3 x^{2}$	-	$7 x$	+	$0$
									-	$3 x^{2}$	+	$0$	-	$1$

Step 14

The expression needs to be subtracted from the dividend, so change all the signs in $- 3 x^{2} + 0 - 1$

$9 x^{2}$

$7 x$

$1$

$3 x^{2}$

$0 x$

$1$

$27 x^{4}$

$21 x^{3}$

$6 x^{2}$

$0 x$

$0$

$27 x^{4}$

$0$

$9 x^{2}$

$21 x^{3}$

$3 x^{2}$

$0 x$

$21 x^{3}$

$0$

$7 x$

$3 x^{2}$

$7 x$

$0$

$3 x^{2}$

$0$

$1$

Step 15

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

$9 x^{2}$

$7 x$

$1$

$3 x^{2}$

$0 x$

$1$

$27 x^{4}$

$21 x^{3}$

$6 x^{2}$

$0 x$

$0$

$27 x^{4}$

$0$

$9 x^{2}$

$21 x^{3}$

$3 x^{2}$

$0 x$

$21 x^{3}$

$0$

$7 x$

$3 x^{2}$

$7 x$

$0$

$3 x^{2}$

$0$

$1$

$7 x$

$1$

Step 16

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

$9 x^{2} + 7 x - 1 + \frac{- 7 x + 1}{3 x^{2} + 1}$