Divide Using Long Polynomial Division (3x^4-5x^3+x^2+7x)÷(3x+1)

$(3 x^{4} - 5 x^{3} + x^{2} + 7 x) \div (3 x + 1)$

Step 1

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

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

Step 2

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

$x^{3}$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

Step 3

Multiply the new quotient term by the divisor.

$x^{3}$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

$3 x^{4}$

$x^{3}$

Step 4

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

$x^{3}$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

$3 x^{4}$

$x^{3}$

Step 5

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

$x^{3}$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

$3 x^{4}$

$x^{3}$

$6 x^{3}$

Step 6

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

$x^{3}$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

$3 x^{4}$

$x^{3}$

$6 x^{3}$

$x^{2}$

Step 7

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

$x^{3}$

$2 x^{2}$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

$3 x^{4}$

$x^{3}$

$6 x^{3}$

$x^{2}$

Step 8

Multiply the new quotient term by the divisor.

$x^{3}$

$2 x^{2}$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

$3 x^{4}$

$x^{3}$

$6 x^{3}$

$x^{2}$

$6 x^{3}$

$2 x^{2}$

Step 9

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

$x^{3}$

$2 x^{2}$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

$3 x^{4}$

$x^{3}$

$6 x^{3}$

$x^{2}$

$6 x^{3}$

$2 x^{2}$

Step 10

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

$x^{3}$

$2 x^{2}$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

$3 x^{4}$

$x^{3}$

$6 x^{3}$

$x^{2}$

$6 x^{3}$

$2 x^{2}$

$3 x^{2}$

Step 11

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

$x^{3}$

$2 x^{2}$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

$3 x^{4}$

$x^{3}$

$6 x^{3}$

$x^{2}$

$6 x^{3}$

$2 x^{2}$

$3 x^{2}$

$7 x$

Step 12

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

$x^{3}$

$2 x^{2}$

$x$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

$3 x^{4}$

$x^{3}$

$6 x^{3}$

$x^{2}$

$6 x^{3}$

$2 x^{2}$

$3 x^{2}$

$7 x$

Step 13

Multiply the new quotient term by the divisor.

$x^{3}$

$2 x^{2}$

$x$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

$3 x^{4}$

$x^{3}$

$6 x^{3}$

$x^{2}$

$6 x^{3}$

$2 x^{2}$

$3 x^{2}$

$7 x$

$3 x^{2}$

$x$

Step 14

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

$x^{3}$

$2 x^{2}$

$x$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

$3 x^{4}$

$x^{3}$

$6 x^{3}$

$x^{2}$

$6 x^{3}$

$2 x^{2}$

$3 x^{2}$

$7 x$

$3 x^{2}$

$x$

Step 15

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

$x^{3}$

$2 x^{2}$

$x$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

$3 x^{4}$

$x^{3}$

$6 x^{3}$

$x^{2}$

$6 x^{3}$

$2 x^{2}$

$3 x^{2}$

$7 x$

$3 x^{2}$

$x$

$6 x$

Step 16

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

$x^{3}$

$2 x^{2}$

$x$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

$3 x^{4}$

$x^{3}$

$6 x^{3}$

$x^{2}$

$6 x^{3}$

$2 x^{2}$

$3 x^{2}$

$7 x$

$3 x^{2}$

$x$

$6 x$

$0$

Step 17

Divide the highest order term in the dividend $6 x$ by the highest order term in divisor $3 x$ .

$x^{3}$

$2 x^{2}$

$x$

$2$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

$3 x^{4}$

$x^{3}$

$6 x^{3}$

$x^{2}$

$6 x^{3}$

$2 x^{2}$

$3 x^{2}$

$7 x$

$3 x^{2}$

$x$

$6 x$

$0$

Step 18

Multiply the new quotient term by the divisor.

$x^{3}$

$2 x^{2}$

$x$

$2$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

$3 x^{4}$

$x^{3}$

$6 x^{3}$

$x^{2}$

$6 x^{3}$

$2 x^{2}$

$3 x^{2}$

$7 x$

$3 x^{2}$

$x$

$6 x$

$0$

$6 x$

$2$

Step 19

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

$x^{3}$

$2 x^{2}$

$x$

$2$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

$3 x^{4}$

$x^{3}$

$6 x^{3}$

$x^{2}$

$6 x^{3}$

$2 x^{2}$

$3 x^{2}$

$7 x$

$3 x^{2}$

$x$

$6 x$

$0$

$6 x$

$2$

Step 20

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

$x^{3}$

$2 x^{2}$

$x$

$2$

$3 x$

$1$

$3 x^{4}$

$5 x^{3}$

$x^{2}$

$7 x$

$0$

$3 x^{4}$

$x^{3}$

$6 x^{3}$

$x^{2}$

$6 x^{3}$

$2 x^{2}$

$3 x^{2}$

$7 x$

$3 x^{2}$

$x$

$6 x$

$0$

$6 x$

$2$

Step 21

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

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

Divide Using Long Polynomial Division (3x^4-5x^3+x^2+7x)÷(3x+1)

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