Pre-Algebra Examples

$\frac{12 x^{4} + 2 x^{3} - 46 x^{2} + 62 x - 28}{3 x^{2} + 5 x - 7}$

Step 1

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

$3 x^{2}$

$5 x$

$7$

$12 x^{4}$

$2 x^{3}$

$46 x^{2}$

$62 x$

$28$

Step 2

Divide the highest order term in the dividend $12 x^{4}$ by the highest order term in divisor $3 x^{2}$ .

$4 x^{2}$

$3 x^{2}$

$5 x$

$7$

$12 x^{4}$

$2 x^{3}$

$46 x^{2}$

$62 x$

$28$

Step 3

Multiply the new quotient term by the divisor.

$4 x^{2}$

$3 x^{2}$

$5 x$

$7$

$12 x^{4}$

$2 x^{3}$

$46 x^{2}$

$62 x$

$28$

$12 x^{4}$

$20 x^{3}$

$28 x^{2}$

Step 4

The expression needs to be subtracted from the dividend, so change all the signs in $12 x^{4} + 20 x^{3} - 28 x^{2}$

$4 x^{2}$

$3 x^{2}$

$5 x$

$7$

$12 x^{4}$

$2 x^{3}$

$46 x^{2}$

$62 x$

$28$

$12 x^{4}$

$20 x^{3}$

$28 x^{2}$

Step 5

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

$4 x^{2}$

$3 x^{2}$

$5 x$

$7$

$12 x^{4}$

$2 x^{3}$

$46 x^{2}$

$62 x$

$28$

$12 x^{4}$

$20 x^{3}$

$28 x^{2}$

$18 x^{3}$

$18 x^{2}$

Step 6

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

$4 x^{2}$

$3 x^{2}$

$5 x$

$7$

$12 x^{4}$

$2 x^{3}$

$46 x^{2}$

$62 x$

$28$

$12 x^{4}$

$20 x^{3}$

$28 x^{2}$

$18 x^{3}$

$18 x^{2}$

$62 x$

Step 7

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

$4 x^{2}$

$6 x$

$3 x^{2}$

$5 x$

$7$

$12 x^{4}$

$2 x^{3}$

$46 x^{2}$

$62 x$

$28$

$12 x^{4}$

$20 x^{3}$

$28 x^{2}$

$18 x^{3}$

$18 x^{2}$

$62 x$

Step 8

Multiply the new quotient term by the divisor.

$4 x^{2}$

$6 x$

$3 x^{2}$

$5 x$

$7$

$12 x^{4}$

$2 x^{3}$

$46 x^{2}$

$62 x$

$28$

$12 x^{4}$

$20 x^{3}$

$28 x^{2}$

$18 x^{3}$

$18 x^{2}$

$62 x$

$18 x^{3}$

$30 x^{2}$

$42 x$

Step 9

The expression needs to be subtracted from the dividend, so change all the signs in $- 18 x^{3} - 30 x^{2} + 42 x$

$4 x^{2}$

$6 x$

$3 x^{2}$

$5 x$

$7$

$12 x^{4}$

$2 x^{3}$

$46 x^{2}$

$62 x$

$28$

$12 x^{4}$

$20 x^{3}$

$28 x^{2}$

$18 x^{3}$

$18 x^{2}$

$62 x$

$18 x^{3}$

$30 x^{2}$

$42 x$

Step 10

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

$4 x^{2}$

$6 x$

$3 x^{2}$

$5 x$

$7$

$12 x^{4}$

$2 x^{3}$

$46 x^{2}$

$62 x$

$28$

$12 x^{4}$

$20 x^{3}$

$28 x^{2}$

$18 x^{3}$

$18 x^{2}$

$62 x$

$18 x^{3}$

$30 x^{2}$

$42 x$

$12 x^{2}$

$20 x$

Step 11

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

$4 x^{2}$

$6 x$

$3 x^{2}$

$5 x$

$7$

$12 x^{4}$

$2 x^{3}$

$46 x^{2}$

$62 x$

$28$

$12 x^{4}$

$20 x^{3}$

$28 x^{2}$

$18 x^{3}$

$18 x^{2}$

$62 x$

$18 x^{3}$

$30 x^{2}$

$42 x$

$12 x^{2}$

$20 x$

$28$

Step 12

Divide the highest order term in the dividend $12 x^{2}$ by the highest order term in divisor $3 x^{2}$ .

$4 x^{2}$

$6 x$

$4$

$3 x^{2}$

$5 x$

$7$

$12 x^{4}$

$2 x^{3}$

$46 x^{2}$

$62 x$

$28$

$12 x^{4}$

$20 x^{3}$

$28 x^{2}$

$18 x^{3}$

$18 x^{2}$

$62 x$

$18 x^{3}$

$30 x^{2}$

$42 x$

$12 x^{2}$

$20 x$

$28$

Step 13

Multiply the new quotient term by the divisor.

$4 x^{2}$

$6 x$

$4$

$3 x^{2}$

$5 x$

$7$

$12 x^{4}$

$2 x^{3}$

$46 x^{2}$

$62 x$

$28$

$12 x^{4}$

$20 x^{3}$

$28 x^{2}$

$18 x^{3}$

$18 x^{2}$

$62 x$

$18 x^{3}$

$30 x^{2}$

$42 x$

$12 x^{2}$

$20 x$

$28$

$12 x^{2}$

$20 x$

$28$

Step 14

The expression needs to be subtracted from the dividend, so change all the signs in $12 x^{2} + 20 x - 28$

$4 x^{2}$

$6 x$

$4$

$3 x^{2}$

$5 x$

$7$

$12 x^{4}$

$2 x^{3}$

$46 x^{2}$

$62 x$

$28$

$12 x^{4}$

$20 x^{3}$

$28 x^{2}$

$18 x^{3}$

$18 x^{2}$

$62 x$

$18 x^{3}$

$30 x^{2}$

$42 x$

$12 x^{2}$

$20 x$

$28$

$12 x^{2}$

$20 x$

$28$

Step 15

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

$4 x^{2}$

$6 x$

$4$

$3 x^{2}$

$5 x$

$7$

$12 x^{4}$

$2 x^{3}$

$46 x^{2}$

$62 x$

$28$

$12 x^{4}$

$20 x^{3}$

$28 x^{2}$

$18 x^{3}$

$18 x^{2}$

$62 x$

$18 x^{3}$

$30 x^{2}$

$42 x$

$12 x^{2}$

$20 x$

$28$

$12 x^{2}$

$20 x$

$28$

$0$

Step 16

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

$4 x^{2} - 6 x + 4$