Algebra Examples

$(10 x^{4} - 14 x^{3} - 10 x^{2} + 6 x - 10) \div (x^{3} - 3 x^{2} + x - 2)$

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 $0$ .

$x^{3}$

$3 x^{2}$

$x$

$2$

$10 x^{4}$

$14 x^{3}$

$10 x^{2}$

$6 x$

$10$

Step 1.2

Divide the highest order term in the dividend $10 x^{4}$ by the highest order term in divisor $x^{3}$ .

									$10 x$
	$x^{3}$	-	$3 x^{2}$	+	$x$	-	$2$		$10 x^{4}$	-	$14 x^{3}$	-	$10 x^{2}$	+	$6 x$	-	$10$

Step 1.3

Multiply the new quotient term by the divisor.

$10 x$

$x^{3}$

$3 x^{2}$

$x$

$2$

$10 x^{4}$

$14 x^{3}$

$10 x^{2}$

$6 x$

$10$

$10 x^{4}$

$30 x^{3}$

$10 x^{2}$

$20 x$

Step 1.4

The expression needs to be subtracted from the dividend, so change all the signs in $10 x^{4} - 30 x^{3} + 10 x^{2} - 20 x$

$10 x$

$x^{3}$

$3 x^{2}$

$x$

$2$

$10 x^{4}$

$14 x^{3}$

$10 x^{2}$

$6 x$

$10$

$10 x^{4}$

$30 x^{3}$

$10 x^{2}$

$20 x$

Step 1.5

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

$10 x$

$x^{3}$

$3 x^{2}$

$x$

$2$

$10 x^{4}$

$14 x^{3}$

$10 x^{2}$

$6 x$

$10$

$10 x^{4}$

$30 x^{3}$

$10 x^{2}$

$20 x$

$16 x^{3}$

$20 x^{2}$

$26 x$

Step 1.6

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

$10 x$

$x^{3}$

$3 x^{2}$

$x$

$2$

$10 x^{4}$

$14 x^{3}$

$10 x^{2}$

$6 x$

$10$

$10 x^{4}$

$30 x^{3}$

$10 x^{2}$

$20 x$

$16 x^{3}$

$20 x^{2}$

$26 x$

$10$

Step 1.7

Divide the highest order term in the dividend $16 x^{3}$ by the highest order term in divisor $x^{3}$ .

$10 x$

$16$

$x^{3}$

$3 x^{2}$

$x$

$2$

$10 x^{4}$

$14 x^{3}$

$10 x^{2}$

$6 x$

$10$

$10 x^{4}$

$30 x^{3}$

$10 x^{2}$

$20 x$

$16 x^{3}$

$20 x^{2}$

$26 x$

$10$

Step 1.8

Multiply the new quotient term by the divisor.

$10 x$

$16$

$x^{3}$

$3 x^{2}$

$x$

$2$

$10 x^{4}$

$14 x^{3}$

$10 x^{2}$

$6 x$

$10$

$10 x^{4}$

$30 x^{3}$

$10 x^{2}$

$20 x$

$16 x^{3}$

$20 x^{2}$

$26 x$

$10$

$16 x^{3}$

$48 x^{2}$

$16 x$

$32$

Step 1.9

The expression needs to be subtracted from the dividend, so change all the signs in $16 x^{3} - 48 x^{2} + 16 x - 32$

$10 x$

$16$

$x^{3}$

$3 x^{2}$

$x$

$2$

$10 x^{4}$

$14 x^{3}$

$10 x^{2}$

$6 x$

$10$

$10 x^{4}$

$30 x^{3}$

$10 x^{2}$

$20 x$

$16 x^{3}$

$20 x^{2}$

$26 x$

$10$

$16 x^{3}$

$48 x^{2}$

$16 x$

$32$

Step 1.10

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

$10 x$

$16$

$x^{3}$

$3 x^{2}$

$x$

$2$

$10 x^{4}$

$14 x^{3}$

$10 x^{2}$

$6 x$

$10$

$10 x^{4}$

$30 x^{3}$

$10 x^{2}$

$20 x$

$16 x^{3}$

$20 x^{2}$

$26 x$

$10$

$16 x^{3}$

$48 x^{2}$

$16 x$

$32$

$28 x^{2}$

$10 x$

$22$

Step 1.11

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

$10 x + 16 + \frac{28 x^{2} + 10 x + 22}{x^{3} - 3 x^{2} + x - 2}$

Step 2

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

$28 x^{2} + 10 x + 22$