Answer
$$(-4x-4i)\cdot3^2=-36i-36x$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(-4x-4i)\cdot3^2& \xlongequal{ }(-4x-4i)\cdot9 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-36x-36i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-36i-36x\end{aligned} $$ | |
| ① | $$ \left( \color{blue}{-4x-4i}\right) \cdot 9 = -36x-36i $$ |
| ② | Combine like terms: $$ -36i-36x = -36i-36x $$ |
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