Question
Answer
$$(-4i)(-4i)=-16$$
Explanation
| $$ \begin{aligned}(-4i)(-4i)& \xlongequal{ }16i^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-16\end{aligned} $$ | |
| ① | $$ 16i^2 = 16 \cdot (-1) = -16 $$ |
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