Simplify (-3i)^2

${(- 3 i)}^{2}$

Step 1

Apply the product rule to $- 3 i$ .

${(- 3)}^{2} i^{2}$

Step 2

Raise $- 3$ to the power of $2$ .

$9 i^{2}$

Step 3

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

$9 \cdot - 1$

Step 4

Multiply $9$ by $- 1$ .

$- 9$

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