Precalculus Examples

$4 i^{2} - 2 i^{3}$

Step 1

Rewrite $i^{2}$ as $- 1$ .

$4 \cdot - 1 - 2 i^{3}$

Step 2

Multiply $4$ by $- 1$ .

$- 4 - 2 i^{3}$

Step 3

Factor out $i^{2}$ .

$- 4 - 2 (i^{2} \cdot i)$

Step 4

Rewrite $i^{2}$ as $- 1$ .

$- 4 - 2 (- 1 \cdot i)$

Step 5

Rewrite $- 1 i$ as $- i$ .

$- 4 - 2 (- i)$

Step 6

Multiply $- 1$ by $- 2$ .

$- 4 + 2 i$

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$