Divide Using Long Polynomial Division (-6x^3+19x^2+8x+12)/(3x^2+x+1)

$\frac{- 6 x^{3} + 19 x^{2} + 8 x + 12}{3 x^{2} + x + 1}$

Step 1

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

$3 x^{2}$

$x$

$1$

$6 x^{3}$

$19 x^{2}$

$8 x$

$12$

Step 2

Divide the highest order term in the dividend $- 6 x^{3}$ by the highest order term in divisor $3 x^{2}$ .

$2 x$

$3 x^{2}$

$x$

$1$

$6 x^{3}$

$19 x^{2}$

$8 x$

$12$

Step 3

Multiply the new quotient term by the divisor.

$2 x$

$3 x^{2}$

$x$

$1$

$6 x^{3}$

$19 x^{2}$

$8 x$

$12$

$6 x^{3}$

$2 x^{2}$

$2 x$

Step 4

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

$2 x$

$3 x^{2}$

$x$

$1$

$6 x^{3}$

$19 x^{2}$

$8 x$

$12$

$6 x^{3}$

$2 x^{2}$

$2 x$

Step 5

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

$2 x$

$3 x^{2}$

$x$

$1$

$6 x^{3}$

$19 x^{2}$

$8 x$

$12$

$6 x^{3}$

$2 x^{2}$

$2 x$

$21 x^{2}$

$10 x$

Step 6

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

$2 x$

$3 x^{2}$

$x$

$1$

$6 x^{3}$

$19 x^{2}$

$8 x$

$12$

$6 x^{3}$

$2 x^{2}$

$2 x$

$21 x^{2}$

$10 x$

$12$

Step 7

Divide the highest order term in the dividend $21 x^{2}$ by the highest order term in divisor $3 x^{2}$ .

$2 x$

$7$

$3 x^{2}$

$x$

$1$

$6 x^{3}$

$19 x^{2}$

$8 x$

$12$

$6 x^{3}$

$2 x^{2}$

$2 x$

$21 x^{2}$

$10 x$

$12$

Step 8

Multiply the new quotient term by the divisor.

$2 x$

$7$

$3 x^{2}$

$x$

$1$

$6 x^{3}$

$19 x^{2}$

$8 x$

$12$

$6 x^{3}$

$2 x^{2}$

$2 x$

$21 x^{2}$

$10 x$

$12$

$21 x^{2}$

$7 x$

$7$

Step 9

The expression needs to be subtracted from the dividend, so change all the signs in $21 x^{2} + 7 x + 7$

$2 x$

$7$

$3 x^{2}$

$x$

$1$

$6 x^{3}$

$19 x^{2}$

$8 x$

$12$

$6 x^{3}$

$2 x^{2}$

$2 x$

$21 x^{2}$

$10 x$

$12$

$21 x^{2}$

$7 x$

$7$

Step 10

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

$2 x$

$7$

$3 x^{2}$

$x$

$1$

$6 x^{3}$

$19 x^{2}$

$8 x$

$12$

$6 x^{3}$

$2 x^{2}$

$2 x$

$21 x^{2}$

$10 x$

$12$

$21 x^{2}$

$7 x$

$7$

$3 x$

$5$

Step 11

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

$- 2 x + 7 + \frac{3 x + 5}{3 x^{2} + x + 1}$

Divide Using Long Polynomial Division (-6x^3+19x^2+8x+12)/(3x^2+x+1)

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