Algebra Examples

$x^{3} - a^{3}$ divided by $x - a$

Step 1

Write the problem as a mathematical expression.

$\frac{x^{3} - a^{3}}{x - a}$

Step 2

To calculate the remainder, first divide the polynomials.

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Step 2.1

Reorder $x^{3}$ and $- a^{3}$ .

$\frac{- a^{3} + x^{3}}{x - a}$

Step 2.2

Reorder $x$ and $- a$ .

$\frac{- a^{3} + x^{3}}{- a + x}$

Step 2.3

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

$x$

$a$

$x^{3}$

$0 x^{2}$

$0 x$

$a^{3}$

Step 2.4

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

					$x^{2}$
	$x$	-	$a$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	-	$a^{3}$

Step 2.5

Multiply the new quotient term by the divisor.

				$x^{2}$
$x$	-	$a$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	-	$a^{3}$
			+	$x^{3}$	-	$x^{2} a$

Step 2.6

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

				$x^{2}$
$x$	-	$a$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	-	$a^{3}$
			-	$x^{3}$	+	$x^{2} a$

Step 2.7

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

				$x^{2}$
$x$	-	$a$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	-	$a^{3}$
			-	$x^{3}$	+	$x^{2} a$
					+	$x^{2} a$

Step 2.8

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

				$x^{2}$
$x$	-	$a$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	-	$a^{3}$
			-	$x^{3}$	+	$x^{2} a$
					+	$x^{2} a$	+	$0 x$

Step 2.9

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

				$x^{2}$	+	$x a$
$x$	-	$a$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	-	$a^{3}$
			-	$x^{3}$	+	$x^{2} a$
					+	$x^{2} a$	+	$0 x$

Step 2.10

Multiply the new quotient term by the divisor.

				$x^{2}$	+	$x a$
$x$	-	$a$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	-	$a^{3}$
			-	$x^{3}$	+	$x^{2} a$
					+	$x^{2} a$	+	$0 x$
					+	$x^{2} a$	-	$x a^{2}$

Step 2.11

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

				$x^{2}$	+	$x a$
$x$	-	$a$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	-	$a^{3}$
			-	$x^{3}$	+	$x^{2} a$
					+	$x^{2} a$	+	$0 x$
					-	$x^{2} a$	+	$x a^{2}$

Step 2.12

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

				$x^{2}$	+	$x a$
$x$	-	$a$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	-	$a^{3}$
			-	$x^{3}$	+	$x^{2} a$
					+	$x^{2} a$	+	$0 x$
					-	$x^{2} a$	+	$x a^{2}$
							+	$x a^{2}$

Step 2.13

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

				$x^{2}$	+	$x a$
$x$	-	$a$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	-	$a^{3}$
			-	$x^{3}$	+	$x^{2} a$
					+	$x^{2} a$	+	$0 x$
					-	$x^{2} a$	+	$x a^{2}$
							+	$x a^{2}$	-	$a^{3}$

Step 2.14

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

				$x^{2}$	+	$x a$	+	$a^{2}$
$x$	-	$a$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	-	$a^{3}$
			-	$x^{3}$	+	$x^{2} a$
					+	$x^{2} a$	+	$0 x$
					-	$x^{2} a$	+	$x a^{2}$
							+	$x a^{2}$	-	$a^{3}$

Step 2.15

Multiply the new quotient term by the divisor.

				$x^{2}$	+	$x a$	+	$a^{2}$
$x$	-	$a$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	-	$a^{3}$
			-	$x^{3}$	+	$x^{2} a$
					+	$x^{2} a$	+	$0 x$
					-	$x^{2} a$	+	$x a^{2}$
							+	$x a^{2}$	-	$a^{3}$
							+	$a^{2} x$	-	$a^{3}$

Step 2.16

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

				$x^{2}$	+	$x a$	+	$a^{2}$
$x$	-	$a$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	-	$a^{3}$
			-	$x^{3}$	+	$x^{2} a$
					+	$x^{2} a$	+	$0 x$
					-	$x^{2} a$	+	$x a^{2}$
							+	$x a^{2}$	-	$a^{3}$
							-	$a^{2} x$	+	$a^{3}$

Step 2.17

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

				$x^{2}$	+	$x a$	+	$a^{2}$
$x$	-	$a$		$x^{3}$	+	$0 x^{2}$	+	$0 x$	-	$a^{3}$
			-	$x^{3}$	+	$x^{2} a$
					+	$x^{2} a$	+	$0 x$
					-	$x^{2} a$	+	$x a^{2}$
							+	$x a^{2}$	-	$a^{3}$
							-	$a^{2} x$	+	$a^{3}$
										$0$

Step 2.18

Since the remander is $0$ , the final answer is the quotient.

$x^{2} + x a + a^{2}$

Step 3

Since the final term in the resulting expression is not a fraction, the remainder is $0$ .

$0$