Finite Math Examples

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

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

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

$5$

x^{3}

$x^{3}$

x^{2}

$x^{2}$

7 x

$7 x$

0

$0$

Step 2

Divide the highest order term in the dividend

x^{3}

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

x

$x$ .

					$x^{2}$ $x^{2}$
	$x$ $x$	-	$5$ $5$		$x^{3}$ $x^{3}$	-	$x^{2}$ $x^{2}$	+	$7 x$ $7 x$	+	$0$ $0$

Step 3

Multiply the new quotient term by the divisor.

				$x^{2}$ $x^{2}$
$x$ $x$	-	$5$ $5$		$x^{3}$ $x^{3}$	-	$x^{2}$ $x^{2}$	+	$7 x$ $7 x$	+	$0$ $0$
			+	$x^{3}$ $x^{3}$	-	$5 x^{2}$ $5 x^{2}$

Step 4

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

x^{3} - 5 x^{2}

$x^{3} - 5 x^{2}$

				$x^{2}$ $x^{2}$
$x$ $x$	-	$5$ $5$		$x^{3}$ $x^{3}$	-	$x^{2}$ $x^{2}$	+	$7 x$ $7 x$	+	$0$ $0$
			-	$x^{3}$ $x^{3}$	+	$5 x^{2}$ $5 x^{2}$

Step 5

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

				$x^{2}$ $x^{2}$
$x$ $x$	-	$5$ $5$		$x^{3}$ $x^{3}$	-	$x^{2}$ $x^{2}$	+	$7 x$ $7 x$	+	$0$ $0$
			-	$x^{3}$ $x^{3}$	+	$5 x^{2}$ $5 x^{2}$
					+	$4 x^{2}$ $4 x^{2}$

Step 6

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

				$x^{2}$ $x^{2}$
$x$ $x$	-	$5$ $5$		$x^{3}$ $x^{3}$	-	$x^{2}$ $x^{2}$	+	$7 x$ $7 x$	+	$0$ $0$
			-	$x^{3}$ $x^{3}$	+	$5 x^{2}$ $5 x^{2}$
					+	$4 x^{2}$ $4 x^{2}$	+	$7 x$ $7 x$

Step 7

Divide the highest order term in the dividend

4 x^{2}

$4 x^{2}$ by the highest order term in divisor

x

$x$ .

				$x^{2}$ $x^{2}$	+	$4 x$ $4 x$
$x$ $x$	-	$5$ $5$		$x^{3}$ $x^{3}$	-	$x^{2}$ $x^{2}$	+	$7 x$ $7 x$	+	$0$ $0$
			-	$x^{3}$ $x^{3}$	+	$5 x^{2}$ $5 x^{2}$
					+	$4 x^{2}$ $4 x^{2}$	+	$7 x$ $7 x$

Step 8

Multiply the new quotient term by the divisor.

				$x^{2}$ $x^{2}$	+	$4 x$ $4 x$
$x$ $x$	-	$5$ $5$		$x^{3}$ $x^{3}$	-	$x^{2}$ $x^{2}$	+	$7 x$ $7 x$	+	$0$ $0$
			-	$x^{3}$ $x^{3}$	+	$5 x^{2}$ $5 x^{2}$
					+	$4 x^{2}$ $4 x^{2}$	+	$7 x$ $7 x$
					+	$4 x^{2}$ $4 x^{2}$	-	$20 x$ $20 x$

Step 9

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

4 x^{2} - 20 x

$4 x^{2} - 20 x$

				$x^{2}$ $x^{2}$	+	$4 x$ $4 x$
$x$ $x$	-	$5$ $5$		$x^{3}$ $x^{3}$	-	$x^{2}$ $x^{2}$	+	$7 x$ $7 x$	+	$0$ $0$
			-	$x^{3}$ $x^{3}$	+	$5 x^{2}$ $5 x^{2}$
					+	$4 x^{2}$ $4 x^{2}$	+	$7 x$ $7 x$
					-	$4 x^{2}$ $4 x^{2}$	+	$20 x$ $20 x$

Step 10

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

				$x^{2}$ $x^{2}$	+	$4 x$ $4 x$
$x$ $x$	-	$5$ $5$		$x^{3}$ $x^{3}$	-	$x^{2}$ $x^{2}$	+	$7 x$ $7 x$	+	$0$ $0$
			-	$x^{3}$ $x^{3}$	+	$5 x^{2}$ $5 x^{2}$
					+	$4 x^{2}$ $4 x^{2}$	+	$7 x$ $7 x$
					-	$4 x^{2}$ $4 x^{2}$	+	$20 x$ $20 x$
							+	$27 x$ $27 x$

Step 11

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

				$x^{2}$ $x^{2}$	+	$4 x$ $4 x$
$x$ $x$	-	$5$ $5$		$x^{3}$ $x^{3}$	-	$x^{2}$ $x^{2}$	+	$7 x$ $7 x$	+	$0$ $0$
			-	$x^{3}$ $x^{3}$	+	$5 x^{2}$ $5 x^{2}$
					+	$4 x^{2}$ $4 x^{2}$	+	$7 x$ $7 x$
					-	$4 x^{2}$ $4 x^{2}$	+	$20 x$ $20 x$
							+	$27 x$ $27 x$	+	$0$ $0$

Step 12

Divide the highest order term in the dividend

27 x

$27 x$ by the highest order term in divisor

x

$x$ .

				$x^{2}$ $x^{2}$	+	$4 x$ $4 x$	+	$27$ $27$
$x$ $x$	-	$5$ $5$		$x^{3}$ $x^{3}$	-	$x^{2}$ $x^{2}$	+	$7 x$ $7 x$	+	$0$ $0$
			-	$x^{3}$ $x^{3}$	+	$5 x^{2}$ $5 x^{2}$
					+	$4 x^{2}$ $4 x^{2}$	+	$7 x$ $7 x$
					-	$4 x^{2}$ $4 x^{2}$	+	$20 x$ $20 x$
							+	$27 x$ $27 x$	+	$0$ $0$

Step 13

Multiply the new quotient term by the divisor.

				$x^{2}$ $x^{2}$	+	$4 x$ $4 x$	+	$27$ $27$
$x$ $x$	-	$5$ $5$		$x^{3}$ $x^{3}$	-	$x^{2}$ $x^{2}$	+	$7 x$ $7 x$	+	$0$ $0$
			-	$x^{3}$ $x^{3}$	+	$5 x^{2}$ $5 x^{2}$
					+	$4 x^{2}$ $4 x^{2}$	+	$7 x$ $7 x$
					-	$4 x^{2}$ $4 x^{2}$	+	$20 x$ $20 x$
							+	$27 x$ $27 x$	+	$0$ $0$
							+	$27 x$ $27 x$	-	$135$ $135$

Step 14

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

27 x - 135

$27 x - 135$

				$x^{2}$ $x^{2}$	+	$4 x$ $4 x$	+	$27$ $27$
$x$ $x$	-	$5$ $5$		$x^{3}$ $x^{3}$	-	$x^{2}$ $x^{2}$	+	$7 x$ $7 x$	+	$0$ $0$
			-	$x^{3}$ $x^{3}$	+	$5 x^{2}$ $5 x^{2}$
					+	$4 x^{2}$ $4 x^{2}$	+	$7 x$ $7 x$
					-	$4 x^{2}$ $4 x^{2}$	+	$20 x$ $20 x$
							+	$27 x$ $27 x$	+	$0$ $0$
							-	$27 x$ $27 x$	+	$135$ $135$

Step 15

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

				$x^{2}$ $x^{2}$	+	$4 x$ $4 x$	+	$27$ $27$
$x$ $x$	-	$5$ $5$		$x^{3}$ $x^{3}$	-	$x^{2}$ $x^{2}$	+	$7 x$ $7 x$	+	$0$ $0$
			-	$x^{3}$ $x^{3}$	+	$5 x^{2}$ $5 x^{2}$
					+	$4 x^{2}$ $4 x^{2}$	+	$7 x$ $7 x$
					-	$4 x^{2}$ $4 x^{2}$	+	$20 x$ $20 x$
							+	$27 x$ $27 x$	+	$0$ $0$
							-	$27 x$ $27 x$	+	$135$ $135$
									+	$135$ $135$

Step 16

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

x^{2} + 4 x + 27 + \frac{135}{x - 5}

$x^{2} + 4 x + 27 + \frac{135}{x - 5}$

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