Finite Math Examples

(2 x^{3} - x^{2} - 48 x + 15) \div (x - 5)

$(2 x^{3} - x^{2} - 48 x + 15) \div (x - 5)$

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

$0$ .

x

$x$

5

$5$

2 x^{3}

$2 x^{3}$

x^{2}

$x^{2}$

48 x

$48 x$

15

$15$

Step 2

Divide the highest order term in the dividend

2 x^{3}

$2 x^{3}$ by the highest order term in divisor

x

$x$ .

					$2 x^{2}$ $2 x^{2}$
	$x$ $x$	-	$5$ $5$		$2 x^{3}$ $2 x^{3}$	-	$x^{2}$ $x^{2}$	-	$48 x$ $48 x$	+	$15$ $15$

Step 3

Multiply the new quotient term by the divisor.

				$2 x^{2}$ $2 x^{2}$
$x$ $x$	-	$5$ $5$		$2 x^{3}$ $2 x^{3}$	-	$x^{2}$ $x^{2}$	-	$48 x$ $48 x$	+	$15$ $15$
			+	$2 x^{3}$ $2 x^{3}$	-	$10 x^{2}$ $10 x^{2}$

Step 4

The expression needs to be subtracted from the dividend, so change all the signs in

2 x^{3} - 10 x^{2}

$2 x^{3} - 10 x^{2}$

				$2 x^{2}$ $2 x^{2}$
$x$ $x$	-	$5$ $5$		$2 x^{3}$ $2 x^{3}$	-	$x^{2}$ $x^{2}$	-	$48 x$ $48 x$	+	$15$ $15$
			-	$2 x^{3}$ $2 x^{3}$	+	$10 x^{2}$ $10 x^{2}$

Step 5

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

				$2 x^{2}$ $2 x^{2}$
$x$ $x$	-	$5$ $5$		$2 x^{3}$ $2 x^{3}$	-	$x^{2}$ $x^{2}$	-	$48 x$ $48 x$	+	$15$ $15$
			-	$2 x^{3}$ $2 x^{3}$	+	$10 x^{2}$ $10 x^{2}$
					+	$9 x^{2}$ $9 x^{2}$

Step 6

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

				$2 x^{2}$ $2 x^{2}$
$x$ $x$	-	$5$ $5$		$2 x^{3}$ $2 x^{3}$	-	$x^{2}$ $x^{2}$	-	$48 x$ $48 x$	+	$15$ $15$
			-	$2 x^{3}$ $2 x^{3}$	+	$10 x^{2}$ $10 x^{2}$
					+	$9 x^{2}$ $9 x^{2}$	-	$48 x$ $48 x$

Step 7

Divide the highest order term in the dividend

9 x^{2}

$9 x^{2}$ by the highest order term in divisor

x

$x$ .

				$2 x^{2}$ $2 x^{2}$	+	$9 x$ $9 x$
$x$ $x$	-	$5$ $5$		$2 x^{3}$ $2 x^{3}$	-	$x^{2}$ $x^{2}$	-	$48 x$ $48 x$	+	$15$ $15$
			-	$2 x^{3}$ $2 x^{3}$	+	$10 x^{2}$ $10 x^{2}$
					+	$9 x^{2}$ $9 x^{2}$	-	$48 x$ $48 x$

Step 8

Multiply the new quotient term by the divisor.

				$2 x^{2}$ $2 x^{2}$	+	$9 x$ $9 x$
$x$ $x$	-	$5$ $5$		$2 x^{3}$ $2 x^{3}$	-	$x^{2}$ $x^{2}$	-	$48 x$ $48 x$	+	$15$ $15$
			-	$2 x^{3}$ $2 x^{3}$	+	$10 x^{2}$ $10 x^{2}$
					+	$9 x^{2}$ $9 x^{2}$	-	$48 x$ $48 x$
					+	$9 x^{2}$ $9 x^{2}$	-	$45 x$ $45 x$

Step 9

The expression needs to be subtracted from the dividend, so change all the signs in

9 x^{2} - 45 x

$9 x^{2} - 45 x$

				$2 x^{2}$ $2 x^{2}$	+	$9 x$ $9 x$
$x$ $x$	-	$5$ $5$		$2 x^{3}$ $2 x^{3}$	-	$x^{2}$ $x^{2}$	-	$48 x$ $48 x$	+	$15$ $15$
			-	$2 x^{3}$ $2 x^{3}$	+	$10 x^{2}$ $10 x^{2}$
					+	$9 x^{2}$ $9 x^{2}$	-	$48 x$ $48 x$
					-	$9 x^{2}$ $9 x^{2}$	+	$45 x$ $45 x$

Step 10

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

				$2 x^{2}$ $2 x^{2}$	+	$9 x$ $9 x$
$x$ $x$	-	$5$ $5$		$2 x^{3}$ $2 x^{3}$	-	$x^{2}$ $x^{2}$	-	$48 x$ $48 x$	+	$15$ $15$
			-	$2 x^{3}$ $2 x^{3}$	+	$10 x^{2}$ $10 x^{2}$
					+	$9 x^{2}$ $9 x^{2}$	-	$48 x$ $48 x$
					-	$9 x^{2}$ $9 x^{2}$	+	$45 x$ $45 x$
							-	$3 x$ $3 x$

Step 11

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

				$2 x^{2}$ $2 x^{2}$	+	$9 x$ $9 x$
$x$ $x$	-	$5$ $5$		$2 x^{3}$ $2 x^{3}$	-	$x^{2}$ $x^{2}$	-	$48 x$ $48 x$	+	$15$ $15$
			-	$2 x^{3}$ $2 x^{3}$	+	$10 x^{2}$ $10 x^{2}$
					+	$9 x^{2}$ $9 x^{2}$	-	$48 x$ $48 x$
					-	$9 x^{2}$ $9 x^{2}$	+	$45 x$ $45 x$
							-	$3 x$ $3 x$	+	$15$ $15$

Step 12

Divide the highest order term in the dividend

- 3 x

$- 3 x$ by the highest order term in divisor

x

$x$ .

				$2 x^{2}$ $2 x^{2}$	+	$9 x$ $9 x$	-	$3$ $3$
$x$ $x$	-	$5$ $5$		$2 x^{3}$ $2 x^{3}$	-	$x^{2}$ $x^{2}$	-	$48 x$ $48 x$	+	$15$ $15$
			-	$2 x^{3}$ $2 x^{3}$	+	$10 x^{2}$ $10 x^{2}$
					+	$9 x^{2}$ $9 x^{2}$	-	$48 x$ $48 x$
					-	$9 x^{2}$ $9 x^{2}$	+	$45 x$ $45 x$
							-	$3 x$ $3 x$	+	$15$ $15$

Step 13

Multiply the new quotient term by the divisor.

				$2 x^{2}$ $2 x^{2}$	+	$9 x$ $9 x$	-	$3$ $3$
$x$ $x$	-	$5$ $5$		$2 x^{3}$ $2 x^{3}$	-	$x^{2}$ $x^{2}$	-	$48 x$ $48 x$	+	$15$ $15$
			-	$2 x^{3}$ $2 x^{3}$	+	$10 x^{2}$ $10 x^{2}$
					+	$9 x^{2}$ $9 x^{2}$	-	$48 x$ $48 x$
					-	$9 x^{2}$ $9 x^{2}$	+	$45 x$ $45 x$
							-	$3 x$ $3 x$	+	$15$ $15$
							-	$3 x$ $3 x$	+	$15$ $15$

Step 14

The expression needs to be subtracted from the dividend, so change all the signs in

- 3 x + 15

$- 3 x + 15$

				$2 x^{2}$ $2 x^{2}$	+	$9 x$ $9 x$	-	$3$ $3$
$x$ $x$	-	$5$ $5$		$2 x^{3}$ $2 x^{3}$	-	$x^{2}$ $x^{2}$	-	$48 x$ $48 x$	+	$15$ $15$
			-	$2 x^{3}$ $2 x^{3}$	+	$10 x^{2}$ $10 x^{2}$
					+	$9 x^{2}$ $9 x^{2}$	-	$48 x$ $48 x$
					-	$9 x^{2}$ $9 x^{2}$	+	$45 x$ $45 x$
							-	$3 x$ $3 x$	+	$15$ $15$
							+	$3 x$ $3 x$	-	$15$ $15$

Step 15

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

				$2 x^{2}$ $2 x^{2}$	+	$9 x$ $9 x$	-	$3$ $3$
$x$ $x$	-	$5$ $5$		$2 x^{3}$ $2 x^{3}$	-	$x^{2}$ $x^{2}$	-	$48 x$ $48 x$	+	$15$ $15$
			-	$2 x^{3}$ $2 x^{3}$	+	$10 x^{2}$ $10 x^{2}$
					+	$9 x^{2}$ $9 x^{2}$	-	$48 x$ $48 x$
					-	$9 x^{2}$ $9 x^{2}$	+	$45 x$ $45 x$
							-	$3 x$ $3 x$	+	$15$ $15$
							+	$3 x$ $3 x$	-	$15$ $15$
										$0$ $0$

Step 16

Since the remainder is

0

$0$ , the final answer is the quotient.

2 x^{2} + 9 x - 3

$2 x^{2} + 9 x - 3$

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