Pre-Algebra Examples

$\frac{20 x^{4} - 7 x - 14 x^{2} + 29 x - 28}{5 x^{2} + 2 x - 7}$

Step 1

Expand $20 x^{4} - 7 x - 14 x^{2} + 29 x - 28$ .

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Step 1.1

Move $- 7 x$ .

$\frac{20 x^{4} - 14 x^{2} - 7 x + 29 x - 28}{5 x^{2} + 2 x - 7}$

Step 1.2

Move $- 7 x$ .

$\frac{20 x^{4} - 14 x^{2} + 29 x - 7 x - 28}{5 x^{2} + 2 x - 7}$

Step 1.3

Subtract $7 x$ from $29 x$ .

$\frac{20 x^{4} - 14 x^{2} + 22 x - 28}{5 x^{2} + 2 x - 7}$

Step 2

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

$5 x^{2}$

$2 x$

$7$

$20 x^{4}$

$0 x^{3}$

$14 x^{2}$

$22 x$

$28$

Step 3

Divide the highest order term in the dividend $20 x^{4}$ by the highest order term in divisor $5 x^{2}$ .

$4 x^{2}$

$5 x^{2}$

$2 x$

$7$

$20 x^{4}$

$0 x^{3}$

$14 x^{2}$

$22 x$

$28$

Step 4

Multiply the new quotient term by the divisor.

$4 x^{2}$

$5 x^{2}$

$2 x$

$7$

$20 x^{4}$

$0 x^{3}$

$14 x^{2}$

$22 x$

$28$

$20 x^{4}$

$8 x^{3}$

$28 x^{2}$

Step 5

The expression needs to be subtracted from the dividend, so change all the signs in $20 x^{4} + 8 x^{3} - 28 x^{2}$

$4 x^{2}$

$5 x^{2}$

$2 x$

$7$

$20 x^{4}$

$0 x^{3}$

$14 x^{2}$

$22 x$

$28$

$20 x^{4}$

$8 x^{3}$

$28 x^{2}$

Step 6

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

$4 x^{2}$

$5 x^{2}$

$2 x$

$7$

$20 x^{4}$

$0 x^{3}$

$14 x^{2}$

$22 x$

$28$

$20 x^{4}$

$8 x^{3}$

$28 x^{2}$

$8 x^{3}$

$14 x^{2}$

Step 7

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

$4 x^{2}$

$5 x^{2}$

$2 x$

$7$

$20 x^{4}$

$0 x^{3}$

$14 x^{2}$

$22 x$

$28$

$20 x^{4}$

$8 x^{3}$

$28 x^{2}$

$8 x^{3}$

$14 x^{2}$

$22 x$

Step 8

Divide the highest order term in the dividend $- 8 x^{3}$ by the highest order term in divisor $5 x^{2}$ .

$4 x^{2}$

$\frac{8 x}{5}$

$5 x^{2}$

$2 x$

$7$

$20 x^{4}$

$0 x^{3}$

$14 x^{2}$

$22 x$

$28$

$20 x^{4}$

$8 x^{3}$

$28 x^{2}$

$8 x^{3}$

$14 x^{2}$

$22 x$

Step 9

Multiply the new quotient term by the divisor.

$4 x^{2}$

$\frac{8 x}{5}$

$5 x^{2}$

$2 x$

$7$

$20 x^{4}$

$0 x^{3}$

$14 x^{2}$

$22 x$

$28$

$20 x^{4}$

$8 x^{3}$

$28 x^{2}$

$8 x^{3}$

$14 x^{2}$

$22 x$

$8 x^{3}$

$\frac{16 x^{2}}{5}$

$\frac{56 x}{5}$

Step 10

The expression needs to be subtracted from the dividend, so change all the signs in $- 8 x^{3} - \frac{16 x^{2}}{5} + \frac{56 x}{5}$

$4 x^{2}$

$\frac{8 x}{5}$

$5 x^{2}$

$2 x$

$7$

$20 x^{4}$

$0 x^{3}$

$14 x^{2}$

$22 x$

$28$

$20 x^{4}$

$8 x^{3}$

$28 x^{2}$

$8 x^{3}$

$14 x^{2}$

$22 x$

$8 x^{3}$

$\frac{16 x^{2}}{5}$

$\frac{56 x}{5}$

Step 11

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

$4 x^{2}$

$\frac{8 x}{5}$

$5 x^{2}$

$2 x$

$7$

$20 x^{4}$

$0 x^{3}$

$14 x^{2}$

$22 x$

$28$

$20 x^{4}$

$8 x^{3}$

$28 x^{2}$

$8 x^{3}$

$14 x^{2}$

$22 x$

$8 x^{3}$

$\frac{16 x^{2}}{5}$

$\frac{56 x}{5}$

$\frac{86 x^{2}}{5}$

$\frac{54 x}{5}$

Step 12

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

$4 x^{2}$

$\frac{8 x}{5}$

$5 x^{2}$

$2 x$

$7$

$20 x^{4}$

$0 x^{3}$

$14 x^{2}$

$22 x$

$28$

$20 x^{4}$

$8 x^{3}$

$28 x^{2}$

$8 x^{3}$

$14 x^{2}$

$22 x$

$8 x^{3}$

$\frac{16 x^{2}}{5}$

$\frac{56 x}{5}$

$\frac{86 x^{2}}{5}$

$\frac{54 x}{5}$

$28$

Step 13

Divide the highest order term in the dividend $\frac{86 x^{2}}{5}$ by the highest order term in divisor $5 x^{2}$ .

$4 x^{2}$

$\frac{8 x}{5}$

$\frac{86}{25}$

$5 x^{2}$

$2 x$

$7$

$20 x^{4}$

$0 x^{3}$

$14 x^{2}$

$22 x$

$28$

$20 x^{4}$

$8 x^{3}$

$28 x^{2}$

$8 x^{3}$

$14 x^{2}$

$22 x$

$8 x^{3}$

$\frac{16 x^{2}}{5}$

$\frac{56 x}{5}$

$\frac{86 x^{2}}{5}$

$\frac{54 x}{5}$

$28$

Step 14

Multiply the new quotient term by the divisor.

$4 x^{2}$

$\frac{8 x}{5}$

$\frac{86}{25}$

$5 x^{2}$

$2 x$

$7$

$20 x^{4}$

$0 x^{3}$

$14 x^{2}$

$22 x$

$28$

$20 x^{4}$

$8 x^{3}$

$28 x^{2}$

$8 x^{3}$

$14 x^{2}$

$22 x$

$8 x^{3}$

$\frac{16 x^{2}}{5}$

$\frac{56 x}{5}$

$\frac{86 x^{2}}{5}$

$\frac{54 x}{5}$

$28$

$\frac{86 x^{2}}{5}$

$\frac{172 x}{25}$

$\frac{602}{25}$

Step 15

The expression needs to be subtracted from the dividend, so change all the signs in $\frac{86 x^{2}}{5} + \frac{172 x}{25} - \frac{602}{25}$

$4 x^{2}$

$\frac{8 x}{5}$

$\frac{86}{25}$

$5 x^{2}$

$2 x$

$7$

$20 x^{4}$

$0 x^{3}$

$14 x^{2}$

$22 x$

$28$

$20 x^{4}$

$8 x^{3}$

$28 x^{2}$

$8 x^{3}$

$14 x^{2}$

$22 x$

$8 x^{3}$

$\frac{16 x^{2}}{5}$

$\frac{56 x}{5}$

$\frac{86 x^{2}}{5}$

$\frac{54 x}{5}$

$28$

$\frac{86 x^{2}}{5}$

$\frac{172 x}{25}$

$\frac{602}{25}$

Step 16

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

$4 x^{2}$

$\frac{8 x}{5}$

$\frac{86}{25}$

$5 x^{2}$

$2 x$

$7$

$20 x^{4}$

$0 x^{3}$

$14 x^{2}$

$22 x$

$28$

$20 x^{4}$

$8 x^{3}$

$28 x^{2}$

$8 x^{3}$

$14 x^{2}$

$22 x$

$8 x^{3}$

$\frac{16 x^{2}}{5}$

$\frac{56 x}{5}$

$\frac{86 x^{2}}{5}$

$\frac{54 x}{5}$

$28$

$\frac{86 x^{2}}{5}$

$\frac{172 x}{25}$

$\frac{602}{25}$

$\frac{98 x}{25}$

$\frac{98}{25}$

Step 17

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

$4 x^{2} - \frac{8 x}{5} + \frac{86}{25} + \frac{\frac{98 x}{25} - \frac{98}{25}}{5 x^{2} + 2 x - 7}$