Precalculus Examples

$\frac{2 x^{4} - 5 x^{3} + 7 x^{2} - 3 x + 1}{x - 3}$

Step 1

To calculate the remainder, first divide the polynomials.

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Step 1.1

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

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

Step 1.2

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

$2 x^{3}$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

Step 1.3

Multiply the new quotient term by the divisor.

$2 x^{3}$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

$2 x^{4}$

$6 x^{3}$

Step 1.4

The expression needs to be subtracted from the dividend, so change all the signs in $2 x^{4} - 6 x^{3}$

$2 x^{3}$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

$2 x^{4}$

$6 x^{3}$

Step 1.5

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

$2 x^{3}$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

$2 x^{4}$

$6 x^{3}$

$x^{3}$

Step 1.6

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

$2 x^{3}$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

$2 x^{4}$

$6 x^{3}$

$x^{3}$

$7 x^{2}$

Step 1.7

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

$2 x^{3}$

$x^{2}$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

$2 x^{4}$

$6 x^{3}$

$x^{3}$

$7 x^{2}$

Step 1.8

Multiply the new quotient term by the divisor.

$2 x^{3}$

$x^{2}$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

$2 x^{4}$

$6 x^{3}$

$x^{3}$

$7 x^{2}$

$x^{3}$

$3 x^{2}$

Step 1.9

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

$2 x^{3}$

$x^{2}$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

$2 x^{4}$

$6 x^{3}$

$x^{3}$

$7 x^{2}$

$x^{3}$

$3 x^{2}$

Step 1.10

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

$2 x^{3}$

$x^{2}$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

$2 x^{4}$

$6 x^{3}$

$x^{3}$

$7 x^{2}$

$x^{3}$

$3 x^{2}$

$10 x^{2}$

Step 1.11

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

$2 x^{3}$

$x^{2}$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

$2 x^{4}$

$6 x^{3}$

$x^{3}$

$7 x^{2}$

$x^{3}$

$3 x^{2}$

$10 x^{2}$

$3 x$

Step 1.12

Divide the highest order term in the dividend $10 x^{2}$ by the highest order term in divisor $x$ .

$2 x^{3}$

$x^{2}$

$10 x$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

$2 x^{4}$

$6 x^{3}$

$x^{3}$

$7 x^{2}$

$x^{3}$

$3 x^{2}$

$10 x^{2}$

$3 x$

Step 1.13

Multiply the new quotient term by the divisor.

$2 x^{3}$

$x^{2}$

$10 x$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

$2 x^{4}$

$6 x^{3}$

$x^{3}$

$7 x^{2}$

$x^{3}$

$3 x^{2}$

$10 x^{2}$

$3 x$

$10 x^{2}$

$30 x$

Step 1.14

The expression needs to be subtracted from the dividend, so change all the signs in $10 x^{2} - 30 x$

$2 x^{3}$

$x^{2}$

$10 x$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

$2 x^{4}$

$6 x^{3}$

$x^{3}$

$7 x^{2}$

$x^{3}$

$3 x^{2}$

$10 x^{2}$

$3 x$

$10 x^{2}$

$30 x$

Step 1.15

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

$2 x^{3}$

$x^{2}$

$10 x$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

$2 x^{4}$

$6 x^{3}$

$x^{3}$

$7 x^{2}$

$x^{3}$

$3 x^{2}$

$10 x^{2}$

$3 x$

$10 x^{2}$

$30 x$

$27 x$

Step 1.16

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

$2 x^{3}$

$x^{2}$

$10 x$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

$2 x^{4}$

$6 x^{3}$

$x^{3}$

$7 x^{2}$

$x^{3}$

$3 x^{2}$

$10 x^{2}$

$3 x$

$10 x^{2}$

$30 x$

$27 x$

$1$

Step 1.17

Divide the highest order term in the dividend $27 x$ by the highest order term in divisor $x$ .

$2 x^{3}$

$x^{2}$

$10 x$

$27$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

$2 x^{4}$

$6 x^{3}$

$x^{3}$

$7 x^{2}$

$x^{3}$

$3 x^{2}$

$10 x^{2}$

$3 x$

$10 x^{2}$

$30 x$

$27 x$

$1$

Step 1.18

Multiply the new quotient term by the divisor.

$2 x^{3}$

$x^{2}$

$10 x$

$27$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

$2 x^{4}$

$6 x^{3}$

$x^{3}$

$7 x^{2}$

$x^{3}$

$3 x^{2}$

$10 x^{2}$

$3 x$

$10 x^{2}$

$30 x$

$27 x$

$1$

$27 x$

$81$

Step 1.19

The expression needs to be subtracted from the dividend, so change all the signs in $27 x - 81$

$2 x^{3}$

$x^{2}$

$10 x$

$27$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

$2 x^{4}$

$6 x^{3}$

$x^{3}$

$7 x^{2}$

$x^{3}$

$3 x^{2}$

$10 x^{2}$

$3 x$

$10 x^{2}$

$30 x$

$27 x$

$1$

$27 x$

$81$

Step 1.20

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

$2 x^{3}$

$x^{2}$

$10 x$

$27$

$x$

$3$

$2 x^{4}$

$5 x^{3}$

$7 x^{2}$

$3 x$

$1$

$2 x^{4}$

$6 x^{3}$

$x^{3}$

$7 x^{2}$

$x^{3}$

$3 x^{2}$

$10 x^{2}$

$3 x$

$10 x^{2}$

$30 x$

$27 x$

$1$

$27 x$

$81$

$82$

Step 1.21

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

$2 x^{3} + x^{2} + 10 x + 27 + \frac{82}{x - 3}$

Step 2

Since the last term in the resulting expression is a fraction, the numerator of the fraction is the remainder.

$82$