Algebra Examples

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

Step 1

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

$x$

$3$

$x^{4}$

$5 x^{3}$

$6 x^{2}$

$0 x$

$4$

Step 2

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

$x^{3}$

$x$

$3$

$x^{4}$

$5 x^{3}$

$6 x^{2}$

$0 x$

$4$

Step 3

Multiply the new quotient term by the divisor.

$x^{3}$

$x$

$3$

$x^{4}$

$5 x^{3}$

$6 x^{2}$

$0 x$

$4$

$x^{4}$

$3 x^{3}$

Step 4

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

$x^{3}$

$x$

$3$

$x^{4}$

$5 x^{3}$

$6 x^{2}$

$0 x$

$4$

$x^{4}$

$3 x^{3}$

Step 5

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

$x^{3}$

$x$

$3$

$x^{4}$

$5 x^{3}$

$6 x^{2}$

$0 x$

$4$

$x^{4}$

$3 x^{3}$

$2 x^{3}$

Step 6

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

$x^{3}$

$x$

$3$

$x^{4}$

$5 x^{3}$

$6 x^{2}$

$0 x$

$4$

$x^{4}$

$3 x^{3}$

$2 x^{3}$

$6 x^{2}$

Step 7

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

$x^{3}$

$2 x^{2}$

$x$

$3$

$x^{4}$

$5 x^{3}$

$6 x^{2}$

$0 x$

$4$

$x^{4}$

$3 x^{3}$

$2 x^{3}$

$6 x^{2}$

Step 8

Multiply the new quotient term by the divisor.

$x^{3}$

$2 x^{2}$

$x$

$3$

$x^{4}$

$5 x^{3}$

$6 x^{2}$

$0 x$

$4$

$x^{4}$

$3 x^{3}$

$2 x^{3}$

$6 x^{2}$

$2 x^{3}$

$6 x^{2}$

Step 9

The expression needs to be subtracted from the dividend, so change all the signs in $2 x^{3} + 6 x^{2}$

$x^{3}$

$2 x^{2}$

$x$

$3$

$x^{4}$

$5 x^{3}$

$6 x^{2}$

$0 x$

$4$

$x^{4}$

$3 x^{3}$

$2 x^{3}$

$6 x^{2}$

$2 x^{3}$

$6 x^{2}$

Step 10

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

$x^{3}$

$2 x^{2}$

$x$

$3$

$x^{4}$

$5 x^{3}$

$6 x^{2}$

$0 x$

$4$

$x^{4}$

$3 x^{3}$

$2 x^{3}$

$6 x^{2}$

$2 x^{3}$

$6 x^{2}$

$0$

Step 11

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

$x^{3}$

$2 x^{2}$

$x$

$3$

$x^{4}$

$5 x^{3}$

$6 x^{2}$

$0 x$

$4$

$x^{4}$

$3 x^{3}$

$2 x^{3}$

$6 x^{2}$

$2 x^{3}$

$6 x^{2}$

$0$

$0 x$

$4$

Step 12

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

$x^{3} + 2 x^{2} - \frac{4}{x + 3}$