Finite Math Examples

$\frac{4 x^{3} - 10 i x^{2} + 4 x + (8 - 4 i)}{x - 2 i}$

Step 1

To calculate the remainder, first divide the polynomials.

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Step 1.1

Remove parentheses.

$\frac{4 x^{3} - 10 i x^{2} + 4 x + 8 - 4 i}{x - 2 i}$

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 $0$ .

$x$

$2 i$

$4 x^{3}$

$10 i x^{2}$

$4 x$

$8$

$4 i$

Step 1.3

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

$4 x^{2}$

$x$

$2 i$

$4 x^{3}$

$10 i x^{2}$

$4 x$

$8$

$4 i$

Step 1.4

Multiply the new quotient term by the divisor.

$4 x^{2}$

$x$

$2 i$

$4 x^{3}$

$10 i x^{2}$

$4 x$

$8$

$4 i$

$4 x^{3}$

$8 x^{2} i$

Step 1.5

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

$4 x^{2}$

$x$

$2 i$

$4 x^{3}$

$10 i x^{2}$

$4 x$

$8$

$4 i$

$4 x^{3}$

$8 x^{2} i$

Step 1.6

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

$4 x^{2}$

$x$

$2 i$

$4 x^{3}$

$10 i x^{2}$

$4 x$

$8$

$4 i$

$4 x^{3}$

$8 x^{2} i$

$2 x^{2} i$

Step 1.7

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

$4 x^{2}$

$x$

$2 i$

$4 x^{3}$

$10 i x^{2}$

$4 x$

$8$

$4 i$

$4 x^{3}$

$8 x^{2} i$

$2 x^{2} i$

$4 x$

Step 1.8

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

$4 x^{2}$

$2 x i$

$x$

$2 i$

$4 x^{3}$

$10 i x^{2}$

$4 x$

$8$

$4 i$

$4 x^{3}$

$8 x^{2} i$

$2 x^{2} i$

$4 x$

Step 1.9

Multiply the new quotient term by the divisor.

$4 x^{2}$

$2 x i$

$x$

$2 i$

$4 x^{3}$

$10 i x^{2}$

$4 x$

$8$

$4 i$

$4 x^{3}$

$8 x^{2} i$

$2 x^{2} i$

$4 x$

$2 x^{2} i$

$4 x$

Step 1.10

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

$4 x^{2}$

$2 x i$

$x$

$2 i$

$4 x^{3}$

$10 i x^{2}$

$4 x$

$8$

$4 i$

$4 x^{3}$

$8 x^{2} i$

$2 x^{2} i$

$4 x$

$2 x^{2} i$

$4 x$

Step 1.11

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

$4 x^{2}$

$2 x i$

$x$

$2 i$

$4 x^{3}$

$10 i x^{2}$

$4 x$

$8$

$4 i$

$4 x^{3}$

$8 x^{2} i$

$2 x^{2} i$

$4 x$

$2 x^{2} i$

$4 x$

$8 x$

Step 1.12

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

$4 x^{2}$

$2 x i$

$x$

$2 i$

$4 x^{3}$

$10 i x^{2}$

$4 x$

$8$

$4 i$

$4 x^{3}$

$8 x^{2} i$

$2 x^{2} i$

$4 x$

$2 x^{2} i$

$4 x$

$8 x$

$8$

Step 1.13

Divide the highest order term in the dividend $8 x$ by the highest order term in divisor $x$ .

$4 x^{2}$

$2 x i$

$8$

$x$

$2 i$

$4 x^{3}$

$10 i x^{2}$

$4 x$

$8$

$4 i$

$4 x^{3}$

$8 x^{2} i$

$2 x^{2} i$

$4 x$

$2 x^{2} i$

$4 x$

$8 x$

$8$

Step 1.14

Multiply the new quotient term by the divisor.

$4 x^{2}$

$2 x i$

$8$

$x$

$2 i$

$4 x^{3}$

$10 i x^{2}$

$4 x$

$8$

$4 i$

$4 x^{3}$

$8 x^{2} i$

$2 x^{2} i$

$4 x$

$2 x^{2} i$

$4 x$

$8 x$

$8$

$8 x$

$16 i$

Step 1.15

The expression needs to be subtracted from the dividend, so change all the signs in $8 x - 16 i$

$4 x^{2}$

$2 x i$

$8$

$x$

$2 i$

$4 x^{3}$

$10 i x^{2}$

$4 x$

$8$

$4 i$

$4 x^{3}$

$8 x^{2} i$

$2 x^{2} i$

$4 x$

$2 x^{2} i$

$4 x$

$8 x$

$8$

$8 x$

$16 i$

Step 1.16

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

$4 x^{2}$

$2 x i$

$8$

$x$

$2 i$

$4 x^{3}$

$10 i x^{2}$

$4 x$

$8$

$4 i$

$4 x^{3}$

$8 x^{2} i$

$2 x^{2} i$

$4 x$

$2 x^{2} i$

$4 x$

$8 x$

$8$

$8 x$

$16 i$

$8$

$16 i$

Step 1.17

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

$4 x^{2} - 2 x i + 8 + \frac{8 + 16 i}{x - 2 i}$

Step 2

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

$8 + 16 i$