Finite Math Examples

$\frac{4 x^{3} - 9 x^{3} + 3 x + 7}{4 x^{2} + 8 x + 6}$

Step 1

To calculate the remainder, first divide the polynomials.

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Step 1.1

Subtract $9 x^{3}$ from $4 x^{3}$ .

$\frac{- 5 x^{3} + 3 x + 7}{4 x^{2} + 8 x + 6}$

Step 1.2

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

$4 x^{2}$

$8 x$

$6$

$5 x^{3}$

$0 x^{2}$

$3 x$

$7$

Step 1.3

Divide the highest order term in the dividend $- 5 x^{3}$ by the highest order term in divisor $4 x^{2}$ .

$\frac{5 x}{4}$

$4 x^{2}$

$8 x$

$6$

$5 x^{3}$

$0 x^{2}$

$3 x$

$7$

Step 1.4

Multiply the new quotient term by the divisor.

$\frac{5 x}{4}$

$4 x^{2}$

$8 x$

$6$

$5 x^{3}$

$0 x^{2}$

$3 x$

$7$

$5 x^{3}$

$10 x^{2}$

$\frac{15 x}{2}$

Step 1.5

The expression needs to be subtracted from the dividend, so change all the signs in $- 5 x^{3} - 10 x^{2} - \frac{15 x}{2}$

$\frac{5 x}{4}$

$4 x^{2}$

$8 x$

$6$

$5 x^{3}$

$0 x^{2}$

$3 x$

$7$

$5 x^{3}$

$10 x^{2}$

$\frac{15 x}{2}$

Step 1.6

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

$\frac{5 x}{4}$

$4 x^{2}$

$8 x$

$6$

$5 x^{3}$

$0 x^{2}$

$3 x$

$7$

$5 x^{3}$

$10 x^{2}$

$\frac{15 x}{2}$

$10 x^{2}$

$\frac{21 x}{2}$

Step 1.7

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

$\frac{5 x}{4}$

$4 x^{2}$

$8 x$

$6$

$5 x^{3}$

$0 x^{2}$

$3 x$

$7$

$5 x^{3}$

$10 x^{2}$

$\frac{15 x}{2}$

$10 x^{2}$

$\frac{21 x}{2}$

$7$

Step 1.8

Divide the highest order term in the dividend $10 x^{2}$ by the highest order term in divisor $4 x^{2}$ .

$\frac{5 x}{4}$

$\frac{5}{2}$

$4 x^{2}$

$8 x$

$6$

$5 x^{3}$

$0 x^{2}$

$3 x$

$7$

$5 x^{3}$

$10 x^{2}$

$\frac{15 x}{2}$

$10 x^{2}$

$\frac{21 x}{2}$

$7$

Step 1.9

Multiply the new quotient term by the divisor.

$\frac{5 x}{4}$

$\frac{5}{2}$

$4 x^{2}$

$8 x$

$6$

$5 x^{3}$

$0 x^{2}$

$3 x$

$7$

$5 x^{3}$

$10 x^{2}$

$\frac{15 x}{2}$

$10 x^{2}$

$\frac{21 x}{2}$

$7$

$10 x^{2}$

$20 x$

$15$

Step 1.10

The expression needs to be subtracted from the dividend, so change all the signs in $10 x^{2} + 20 x + 15$

$\frac{5 x}{4}$

$\frac{5}{2}$

$4 x^{2}$

$8 x$

$6$

$5 x^{3}$

$0 x^{2}$

$3 x$

$7$

$5 x^{3}$

$10 x^{2}$

$\frac{15 x}{2}$

$10 x^{2}$

$\frac{21 x}{2}$

$7$

$10 x^{2}$

$20 x$

$15$

Step 1.11

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

$\frac{5 x}{4}$

$\frac{5}{2}$

$4 x^{2}$

$8 x$

$6$

$5 x^{3}$

$0 x^{2}$

$3 x$

$7$

$5 x^{3}$

$10 x^{2}$

$\frac{15 x}{2}$

$10 x^{2}$

$\frac{21 x}{2}$

$7$

$10 x^{2}$

$20 x$

$15$

$\frac{19 x}{2}$

$8$

Step 1.12

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

$- \frac{5 x}{4} + \frac{5}{2} + \frac{- \frac{19 x}{2} - 8}{4 x^{2} + 8 x + 6}$

Step 2

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

$- \frac{19 x}{2} - 8$