Finite Math Examples

$\frac{8 x^{3} + 14 x^{2} + 11 x + 8}{2 x + 1}$

Step 1

To calculate the remainder, first divide the polynomials.

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Step 1.1

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

$2 x$

$1$

$8 x^{3}$

$14 x^{2}$

$11 x$

$8$

Step 1.2

Divide the highest order term in the dividend $8 x^{3}$ by the highest order term in divisor $2 x$ .

					$4 x^{2}$
	$2 x$	+	$1$		$8 x^{3}$	+	$14 x^{2}$	+	$11 x$	+	$8$

Step 1.3

Multiply the new quotient term by the divisor.

				$4 x^{2}$
$2 x$	+	$1$		$8 x^{3}$	+	$14 x^{2}$	+	$11 x$	+	$8$
			+	$8 x^{3}$	+	$4 x^{2}$

Step 1.4

The expression needs to be subtracted from the dividend, so change all the signs in $8 x^{3} + 4 x^{2}$

				$4 x^{2}$
$2 x$	+	$1$		$8 x^{3}$	+	$14 x^{2}$	+	$11 x$	+	$8$
			-	$8 x^{3}$	-	$4 x^{2}$

Step 1.5

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

				$4 x^{2}$
$2 x$	+	$1$		$8 x^{3}$	+	$14 x^{2}$	+	$11 x$	+	$8$
			-	$8 x^{3}$	-	$4 x^{2}$
					+	$10 x^{2}$

Step 1.6

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

				$4 x^{2}$
$2 x$	+	$1$		$8 x^{3}$	+	$14 x^{2}$	+	$11 x$	+	$8$
			-	$8 x^{3}$	-	$4 x^{2}$
					+	$10 x^{2}$	+	$11 x$

Step 1.7

Divide the highest order term in the dividend $10 x^{2}$ by the highest order term in divisor $2 x$ .

				$4 x^{2}$	+	$5 x$
$2 x$	+	$1$		$8 x^{3}$	+	$14 x^{2}$	+	$11 x$	+	$8$
			-	$8 x^{3}$	-	$4 x^{2}$
					+	$10 x^{2}$	+	$11 x$

Step 1.8

Multiply the new quotient term by the divisor.

				$4 x^{2}$	+	$5 x$
$2 x$	+	$1$		$8 x^{3}$	+	$14 x^{2}$	+	$11 x$	+	$8$
			-	$8 x^{3}$	-	$4 x^{2}$
					+	$10 x^{2}$	+	$11 x$
					+	$10 x^{2}$	+	$5 x$

Step 1.9

The expression needs to be subtracted from the dividend, so change all the signs in $10 x^{2} + 5 x$

				$4 x^{2}$	+	$5 x$
$2 x$	+	$1$		$8 x^{3}$	+	$14 x^{2}$	+	$11 x$	+	$8$
			-	$8 x^{3}$	-	$4 x^{2}$
					+	$10 x^{2}$	+	$11 x$
					-	$10 x^{2}$	-	$5 x$

Step 1.10

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

				$4 x^{2}$	+	$5 x$
$2 x$	+	$1$		$8 x^{3}$	+	$14 x^{2}$	+	$11 x$	+	$8$
			-	$8 x^{3}$	-	$4 x^{2}$
					+	$10 x^{2}$	+	$11 x$
					-	$10 x^{2}$	-	$5 x$
							+	$6 x$

Step 1.11

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

				$4 x^{2}$	+	$5 x$
$2 x$	+	$1$		$8 x^{3}$	+	$14 x^{2}$	+	$11 x$	+	$8$
			-	$8 x^{3}$	-	$4 x^{2}$
					+	$10 x^{2}$	+	$11 x$
					-	$10 x^{2}$	-	$5 x$
							+	$6 x$	+	$8$

Step 1.12

Divide the highest order term in the dividend $6 x$ by the highest order term in divisor $2 x$ .

				$4 x^{2}$	+	$5 x$	+	$3$
$2 x$	+	$1$		$8 x^{3}$	+	$14 x^{2}$	+	$11 x$	+	$8$
			-	$8 x^{3}$	-	$4 x^{2}$
					+	$10 x^{2}$	+	$11 x$
					-	$10 x^{2}$	-	$5 x$
							+	$6 x$	+	$8$

Step 1.13

Multiply the new quotient term by the divisor.

				$4 x^{2}$	+	$5 x$	+	$3$
$2 x$	+	$1$		$8 x^{3}$	+	$14 x^{2}$	+	$11 x$	+	$8$
			-	$8 x^{3}$	-	$4 x^{2}$
					+	$10 x^{2}$	+	$11 x$
					-	$10 x^{2}$	-	$5 x$
							+	$6 x$	+	$8$
							+	$6 x$	+	$3$

Step 1.14

The expression needs to be subtracted from the dividend, so change all the signs in $6 x + 3$

				$4 x^{2}$	+	$5 x$	+	$3$
$2 x$	+	$1$		$8 x^{3}$	+	$14 x^{2}$	+	$11 x$	+	$8$
			-	$8 x^{3}$	-	$4 x^{2}$
					+	$10 x^{2}$	+	$11 x$
					-	$10 x^{2}$	-	$5 x$
							+	$6 x$	+	$8$
							-	$6 x$	-	$3$

Step 1.15

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

				$4 x^{2}$	+	$5 x$	+	$3$
$2 x$	+	$1$		$8 x^{3}$	+	$14 x^{2}$	+	$11 x$	+	$8$
			-	$8 x^{3}$	-	$4 x^{2}$
					+	$10 x^{2}$	+	$11 x$
					-	$10 x^{2}$	-	$5 x$
							+	$6 x$	+	$8$
							-	$6 x$	-	$3$
									+	$5$

Step 1.16

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

$4 x^{2} + 5 x + 3 + \frac{5}{2 x + 1}$

Step 2

Since the last term in the resulting expression is a fraction, the numerator of the fraction is the remainder.

$5$