Finite Math Examples

$\frac{3 x^{3} + 2 x^{2} - 19 x + 6}{3 x - 5}$

Step 1

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

$3 x$

$5$

$3 x^{3}$

$2 x^{2}$

$19 x$

$6$

Step 2

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

					$x^{2}$
	$3 x$	-	$5$		$3 x^{3}$	+	$2 x^{2}$	-	$19 x$	+	$6$

Step 3

Multiply the new quotient term by the divisor.

				$x^{2}$
$3 x$	-	$5$		$3 x^{3}$	+	$2 x^{2}$	-	$19 x$	+	$6$
			+	$3 x^{3}$	-	$5 x^{2}$

Step 4

The expression needs to be subtracted from the dividend, so change all the signs in $3 x^{3} - 5 x^{2}$

				$x^{2}$
$3 x$	-	$5$		$3 x^{3}$	+	$2 x^{2}$	-	$19 x$	+	$6$
			-	$3 x^{3}$	+	$5 x^{2}$

Step 5

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

				$x^{2}$
$3 x$	-	$5$		$3 x^{3}$	+	$2 x^{2}$	-	$19 x$	+	$6$
			-	$3 x^{3}$	+	$5 x^{2}$
					+	$7 x^{2}$

Step 6

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

				$x^{2}$
$3 x$	-	$5$		$3 x^{3}$	+	$2 x^{2}$	-	$19 x$	+	$6$
			-	$3 x^{3}$	+	$5 x^{2}$
					+	$7 x^{2}$	-	$19 x$

Step 7

Divide the highest order term in the dividend $7 x^{2}$ by the highest order term in divisor $3 x$ .

				$x^{2}$	+	$\frac{7 x}{3}$
$3 x$	-	$5$		$3 x^{3}$	+	$2 x^{2}$	-	$19 x$	+	$6$
			-	$3 x^{3}$	+	$5 x^{2}$
					+	$7 x^{2}$	-	$19 x$

Step 8

Multiply the new quotient term by the divisor.

				$x^{2}$	+	$\frac{7 x}{3}$
$3 x$	-	$5$		$3 x^{3}$	+	$2 x^{2}$	-	$19 x$	+	$6$
			-	$3 x^{3}$	+	$5 x^{2}$
					+	$7 x^{2}$	-	$19 x$
					+	$7 x^{2}$	-	$\frac{35 x}{3}$

Step 9

The expression needs to be subtracted from the dividend, so change all the signs in $7 x^{2} - \frac{35 x}{3}$

				$x^{2}$	+	$\frac{7 x}{3}$
$3 x$	-	$5$		$3 x^{3}$	+	$2 x^{2}$	-	$19 x$	+	$6$
			-	$3 x^{3}$	+	$5 x^{2}$
					+	$7 x^{2}$	-	$19 x$
					-	$7 x^{2}$	+	$\frac{35 x}{3}$

Step 10

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

				$x^{2}$	+	$\frac{7 x}{3}$
$3 x$	-	$5$		$3 x^{3}$	+	$2 x^{2}$	-	$19 x$	+	$6$
			-	$3 x^{3}$	+	$5 x^{2}$
					+	$7 x^{2}$	-	$19 x$
					-	$7 x^{2}$	+	$\frac{35 x}{3}$
							-	$\frac{22 x}{3}$

Step 11

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

				$x^{2}$	+	$\frac{7 x}{3}$
$3 x$	-	$5$		$3 x^{3}$	+	$2 x^{2}$	-	$19 x$	+	$6$
			-	$3 x^{3}$	+	$5 x^{2}$
					+	$7 x^{2}$	-	$19 x$
					-	$7 x^{2}$	+	$\frac{35 x}{3}$
							-	$\frac{22 x}{3}$	+	$6$

Step 12

Divide the highest order term in the dividend $- \frac{22 x}{3}$ by the highest order term in divisor $3 x$ .

				$x^{2}$	+	$\frac{7 x}{3}$	-	$\frac{22}{9}$
$3 x$	-	$5$		$3 x^{3}$	+	$2 x^{2}$	-	$19 x$	+	$6$
			-	$3 x^{3}$	+	$5 x^{2}$
					+	$7 x^{2}$	-	$19 x$
					-	$7 x^{2}$	+	$\frac{35 x}{3}$
							-	$\frac{22 x}{3}$	+	$6$

Step 13

Multiply the new quotient term by the divisor.

				$x^{2}$	+	$\frac{7 x}{3}$	-	$\frac{22}{9}$
$3 x$	-	$5$		$3 x^{3}$	+	$2 x^{2}$	-	$19 x$	+	$6$
			-	$3 x^{3}$	+	$5 x^{2}$
					+	$7 x^{2}$	-	$19 x$
					-	$7 x^{2}$	+	$\frac{35 x}{3}$
							-	$\frac{22 x}{3}$	+	$6$
							-	$\frac{22 x}{3}$	+	$\frac{110}{9}$

Step 14

The expression needs to be subtracted from the dividend, so change all the signs in $- \frac{22 x}{3} + \frac{110}{9}$

				$x^{2}$	+	$\frac{7 x}{3}$	-	$\frac{22}{9}$
$3 x$	-	$5$		$3 x^{3}$	+	$2 x^{2}$	-	$19 x$	+	$6$
			-	$3 x^{3}$	+	$5 x^{2}$
					+	$7 x^{2}$	-	$19 x$
					-	$7 x^{2}$	+	$\frac{35 x}{3}$
							-	$\frac{22 x}{3}$	+	$6$
							+	$\frac{22 x}{3}$	-	$\frac{110}{9}$

Step 15

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

				$x^{2}$	+	$\frac{7 x}{3}$	-	$\frac{22}{9}$
$3 x$	-	$5$		$3 x^{3}$	+	$2 x^{2}$	-	$19 x$	+	$6$
			-	$3 x^{3}$	+	$5 x^{2}$
					+	$7 x^{2}$	-	$19 x$
					-	$7 x^{2}$	+	$\frac{35 x}{3}$
							-	$\frac{22 x}{3}$	+	$6$
							+	$\frac{22 x}{3}$	-	$\frac{110}{9}$
									-	$\frac{56}{9}$

Step 16

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

$x^{2} + \frac{7 x}{3} - \frac{22}{9} - \frac{56}{9 (3 x - 5)}$