Answer
$$(-3x)(-2i)^2=12x$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(-3x)(-2i)^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}(-3x)\cdot4i^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}(-3x)\cdot(-4) \xlongequal{ } \\[1 em] & \xlongequal{ }12x\end{aligned} $$ | |
| ① | $$ \left( -2i \right)^2 = (-2)^2i^2 = 4i^2 $$ |
| ② | $$ 4i^2 = 4 \cdot (-1) = -4 $$ |
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