Precalculus Examples

$\frac{- 3 x^{3} + 5 x^{2} - 22 x + 5}{x^{2} + 4}$

Step 1

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

$x^{2}$

$0 x$

$4$

$3 x^{3}$

$5 x^{2}$

$22 x$

$5$

Step 2

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

$3 x$

$x^{2}$

$0 x$

$4$

$3 x^{3}$

$5 x^{2}$

$22 x$

$5$

Step 3

Multiply the new quotient term by the divisor.

$3 x$

$x^{2}$

$0 x$

$4$

$3 x^{3}$

$5 x^{2}$

$22 x$

$5$

$3 x^{3}$

$0$

$12 x$

Step 4

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

$3 x$

$x^{2}$

$0 x$

$4$

$3 x^{3}$

$5 x^{2}$

$22 x$

$5$

$3 x^{3}$

$0$

$12 x$

Step 5

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

$3 x$

$x^{2}$

$0 x$

$4$

$3 x^{3}$

$5 x^{2}$

$22 x$

$5$

$3 x^{3}$

$0$

$12 x$

$5 x^{2}$

$10 x$

Step 6

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

$3 x$

$x^{2}$

$0 x$

$4$

$3 x^{3}$

$5 x^{2}$

$22 x$

$5$

$3 x^{3}$

$0$

$12 x$

$5 x^{2}$

$10 x$

$5$

Step 7

Divide the highest order term in the dividend $5 x^{2}$ by the highest order term in divisor $x^{2}$ .

$3 x$

$5$

$x^{2}$

$0 x$

$4$

$3 x^{3}$

$5 x^{2}$

$22 x$

$5$

$3 x^{3}$

$0$

$12 x$

$5 x^{2}$

$10 x$

$5$

Step 8

Multiply the new quotient term by the divisor.

$3 x$

$5$

$x^{2}$

$0 x$

$4$

$3 x^{3}$

$5 x^{2}$

$22 x$

$5$

$3 x^{3}$

$0$

$12 x$

$5 x^{2}$

$10 x$

$5$

$5 x^{2}$

$0$

$20$

Step 9

The expression needs to be subtracted from the dividend, so change all the signs in $5 x^{2} + 0 + 20$

					-	$3 x$	+	$5$
$x^{2}$	+	$0 x$	+	$4$	-	$3 x^{3}$	+	$5 x^{2}$	-	$22 x$	+	$5$
					+	$3 x^{3}$	-	$0$	+	$12 x$
							+	$5 x^{2}$	-	$10 x$	+	$5$
							-	$5 x^{2}$	-	$0$	-	$20$

Step 10

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

					-	$3 x$	+	$5$
$x^{2}$	+	$0 x$	+	$4$	-	$3 x^{3}$	+	$5 x^{2}$	-	$22 x$	+	$5$
					+	$3 x^{3}$	-	$0$	+	$12 x$
							+	$5 x^{2}$	-	$10 x$	+	$5$
							-	$5 x^{2}$	-	$0$	-	$20$
									-	$10 x$	-	$15$

Step 11

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

$- 3 x + 5 + \frac{- 10 x - 15}{x^{2} + 4}$