Pre-Algebra Examples

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

Step 1

Expand $x^{2} - 7 x - 7 x^{3} + x^{4}$ .

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Step 1.1

Move $- 7 x$ .

$\frac{x^{2} - 7 x^{3} - 7 x + x^{4}}{7 + x}$

Step 1.2

Reorder $x^{2}$ and $- 7 x^{3}$ .

$\frac{- 7 x^{3} + x^{2} - 7 x + x^{4}}{7 + x}$

Step 1.3

Move $- 7 x$ .

$\frac{- 7 x^{3} + x^{2} + x^{4} - 7 x}{7 + x}$

Step 1.4

Move $x^{2}$ .

$\frac{- 7 x^{3} + x^{4} + x^{2} - 7 x}{7 + x}$

Step 1.5

Reorder $- 7 x^{3}$ and $x^{4}$ .

$\frac{x^{4} - 7 x^{3} + x^{2} - 7 x}{7 + x}$

Step 2

Reorder $7$ and $x$ .

$\frac{x^{4} - 7 x^{3} + x^{2} - 7 x}{x + 7}$

Step 3

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

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

Step 4

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

$x^{3}$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

Step 5

Multiply the new quotient term by the divisor.

$x^{3}$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

$x^{4}$

$7 x^{3}$

Step 6

The expression needs to be subtracted from the dividend, so change all the signs in $x^{4} + 7 x^{3}$

$x^{3}$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

$x^{4}$

$7 x^{3}$

Step 7

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

$x^{3}$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

$x^{4}$

$7 x^{3}$

$14 x^{3}$

Step 8

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

$x^{3}$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

$x^{4}$

$7 x^{3}$

$14 x^{3}$

$x^{2}$

Step 9

Divide the highest order term in the dividend $- 14 x^{3}$ by the highest order term in divisor $x$ .

$x^{3}$

$14 x^{2}$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

$x^{4}$

$7 x^{3}$

$14 x^{3}$

$x^{2}$

Step 10

Multiply the new quotient term by the divisor.

$x^{3}$

$14 x^{2}$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

$x^{4}$

$7 x^{3}$

$14 x^{3}$

$x^{2}$

$14 x^{3}$

$98 x^{2}$

Step 11

The expression needs to be subtracted from the dividend, so change all the signs in $- 14 x^{3} - 98 x^{2}$

$x^{3}$

$14 x^{2}$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

$x^{4}$

$7 x^{3}$

$14 x^{3}$

$x^{2}$

$14 x^{3}$

$98 x^{2}$

Step 12

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

$x^{3}$

$14 x^{2}$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

$x^{4}$

$7 x^{3}$

$14 x^{3}$

$x^{2}$

$14 x^{3}$

$98 x^{2}$

$99 x^{2}$

Step 13

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

$x^{3}$

$14 x^{2}$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

$x^{4}$

$7 x^{3}$

$14 x^{3}$

$x^{2}$

$14 x^{3}$

$98 x^{2}$

$99 x^{2}$

$7 x$

Step 14

Divide the highest order term in the dividend $99 x^{2}$ by the highest order term in divisor $x$ .

$x^{3}$

$14 x^{2}$

$99 x$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

$x^{4}$

$7 x^{3}$

$14 x^{3}$

$x^{2}$

$14 x^{3}$

$98 x^{2}$

$99 x^{2}$

$7 x$

Step 15

Multiply the new quotient term by the divisor.

$x^{3}$

$14 x^{2}$

$99 x$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

$x^{4}$

$7 x^{3}$

$14 x^{3}$

$x^{2}$

$14 x^{3}$

$98 x^{2}$

$99 x^{2}$

$7 x$

$99 x^{2}$

$693 x$

Step 16

The expression needs to be subtracted from the dividend, so change all the signs in $99 x^{2} + 693 x$

$x^{3}$

$14 x^{2}$

$99 x$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

$x^{4}$

$7 x^{3}$

$14 x^{3}$

$x^{2}$

$14 x^{3}$

$98 x^{2}$

$99 x^{2}$

$7 x$

$99 x^{2}$

$693 x$

Step 17

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

$x^{3}$

$14 x^{2}$

$99 x$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

$x^{4}$

$7 x^{3}$

$14 x^{3}$

$x^{2}$

$14 x^{3}$

$98 x^{2}$

$99 x^{2}$

$7 x$

$99 x^{2}$

$693 x$

$700 x$

Step 18

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

$x^{3}$

$14 x^{2}$

$99 x$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

$x^{4}$

$7 x^{3}$

$14 x^{3}$

$x^{2}$

$14 x^{3}$

$98 x^{2}$

$99 x^{2}$

$7 x$

$99 x^{2}$

$693 x$

$700 x$

$0$

Step 19

Divide the highest order term in the dividend $- 700 x$ by the highest order term in divisor $x$ .

$x^{3}$

$14 x^{2}$

$99 x$

$700$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

$x^{4}$

$7 x^{3}$

$14 x^{3}$

$x^{2}$

$14 x^{3}$

$98 x^{2}$

$99 x^{2}$

$7 x$

$99 x^{2}$

$693 x$

$700 x$

$0$

Step 20

Multiply the new quotient term by the divisor.

$x^{3}$

$14 x^{2}$

$99 x$

$700$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

$x^{4}$

$7 x^{3}$

$14 x^{3}$

$x^{2}$

$14 x^{3}$

$98 x^{2}$

$99 x^{2}$

$7 x$

$99 x^{2}$

$693 x$

$700 x$

$0$

$700 x$

$4900$

Step 21

The expression needs to be subtracted from the dividend, so change all the signs in $- 700 x - 4900$

$x^{3}$

$14 x^{2}$

$99 x$

$700$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

$x^{4}$

$7 x^{3}$

$14 x^{3}$

$x^{2}$

$14 x^{3}$

$98 x^{2}$

$99 x^{2}$

$7 x$

$99 x^{2}$

$693 x$

$700 x$

$0$

$700 x$

$4900$

Step 22

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

$x^{3}$

$14 x^{2}$

$99 x$

$700$

$x$

$7$

$x^{4}$

$7 x^{3}$

$x^{2}$

$7 x$

$0$

$x^{4}$

$7 x^{3}$

$14 x^{3}$

$x^{2}$

$14 x^{3}$

$98 x^{2}$

$99 x^{2}$

$7 x$

$99 x^{2}$

$693 x$

$700 x$

$0$

$700 x$

$4900$

Step 23

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

$x^{3} - 14 x^{2} + 99 x - 700 + \frac{4900}{x + 7}$