Answer
$$(-3x)^2(-4i)=-36ix^2$$
Explanation
| $$ \begin{aligned}(-3x)^2(-4i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}9x^2(-4i) \xlongequal{ } \\[1 em] & \xlongequal{ }-36ix^2\end{aligned} $$ | |
| ① | $$ \left( -3x \right)^2 = (-3)^2x^2 = 9x^2 $$ |
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