Algebra Examples

$(3 x^{4} - 13 x^{2} - x^{3} + 6 x - 30) \div (3 x^{2} - x + 5)$

Step 1

Move $- 13 x^{2}$ .

$\frac{3 x^{4} - x^{3} - 13 x^{2} + 6 x - 30}{3 x^{2} - x + 5}$

Step 2

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

$3 x^{2}$

$x$

$5$

$3 x^{4}$

$x^{3}$

$13 x^{2}$

$6 x$

$30$

Step 3

Divide the highest order term in the dividend $3 x^{4}$ by the highest order term in divisor $3 x^{2}$ .

							$x^{2}$
	$3 x^{2}$	-	$x$	+	$5$		$3 x^{4}$	-	$x^{3}$	-	$13 x^{2}$	+	$6 x$	-	$30$

Step 4

Multiply the new quotient term by the divisor.

$x^{2}$

$3 x^{2}$

$x$

$5$

$3 x^{4}$

$x^{3}$

$13 x^{2}$

$6 x$

$30$

$3 x^{4}$

$x^{3}$

$5 x^{2}$

Step 5

The expression needs to be subtracted from the dividend, so change all the signs in $3 x^{4} - x^{3} + 5 x^{2}$

$x^{2}$

$3 x^{2}$

$x$

$5$

$3 x^{4}$

$x^{3}$

$13 x^{2}$

$6 x$

$30$

$3 x^{4}$

$x^{3}$

$5 x^{2}$

Step 6

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

$x^{2}$

$3 x^{2}$

$x$

$5$

$3 x^{4}$

$x^{3}$

$13 x^{2}$

$6 x$

$30$

$3 x^{4}$

$x^{3}$

$5 x^{2}$

$18 x^{2}$

Step 7

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

						$x^{2}$
$3 x^{2}$	-	$x$	+	$5$		$3 x^{4}$	-	$x^{3}$	-	$13 x^{2}$	+	$6 x$	-	$30$
					-	$3 x^{4}$	+	$x^{3}$	-	$5 x^{2}$
									-	$18 x^{2}$	+	$6 x$	-	$30$

Step 8

Divide the highest order term in the dividend $- 18 x^{2}$ by the highest order term in divisor $3 x^{2}$ .

						$x^{2}$	+	$0 x$	-	$6$
$3 x^{2}$	-	$x$	+	$5$		$3 x^{4}$	-	$x^{3}$	-	$13 x^{2}$	+	$6 x$	-	$30$
					-	$3 x^{4}$	+	$x^{3}$	-	$5 x^{2}$
									-	$18 x^{2}$	+	$6 x$	-	$30$

Step 9

Multiply the new quotient term by the divisor.

						$x^{2}$	+	$0 x$	-	$6$
$3 x^{2}$	-	$x$	+	$5$		$3 x^{4}$	-	$x^{3}$	-	$13 x^{2}$	+	$6 x$	-	$30$
					-	$3 x^{4}$	+	$x^{3}$	-	$5 x^{2}$
									-	$18 x^{2}$	+	$6 x$	-	$30$
									-	$18 x^{2}$	+	$6 x$	-	$30$

Step 10

The expression needs to be subtracted from the dividend, so change all the signs in $- 18 x^{2} + 6 x - 30$

						$x^{2}$	+	$0 x$	-	$6$
$3 x^{2}$	-	$x$	+	$5$		$3 x^{4}$	-	$x^{3}$	-	$13 x^{2}$	+	$6 x$	-	$30$
					-	$3 x^{4}$	+	$x^{3}$	-	$5 x^{2}$
									-	$18 x^{2}$	+	$6 x$	-	$30$
									+	$18 x^{2}$	-	$6 x$	+	$30$

Step 11

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

						$x^{2}$	+	$0 x$	-	$6$
$3 x^{2}$	-	$x$	+	$5$		$3 x^{4}$	-	$x^{3}$	-	$13 x^{2}$	+	$6 x$	-	$30$
					-	$3 x^{4}$	+	$x^{3}$	-	$5 x^{2}$
									-	$18 x^{2}$	+	$6 x$	-	$30$
									+	$18 x^{2}$	-	$6 x$	+	$30$
														$0$

Step 12

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

$x^{2} + 0 x - 6$