Simplify -3xi^4+9xi

$- 3 x i^{4} + 9 x i$

Step 1

Rewrite $i^{4}$ as $1$ .

Rewrite $i^{4}$ as ${(i^{2})}^{2}$ .

$- 3 x {(i^{2})}^{2} + 9 x i$

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

$- 3 x {(- 1)}^{2} + 9 x i$

Raise $- 1$ to the power of $2$ .

$- 3 x \cdot 1 + 9 x i$

$- 3 x \cdot 1 + 9 x i$

Step 2

Multiply $- 3$ by $1$ .

$- 3 x + 9 x i$

Related Questions