Question
Answer
$$(-8-4i)(-2i)=16i-8$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(-8-4i)(-2i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}16i+8i^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}16i-8\end{aligned} $$ | |
| ① | $$ \left( \color{blue}{-8-4i}\right) \cdot -2i = 16i+8i^2 $$ |
| ② | $$ 8i^2 = 8 \cdot (-1) = -8 $$ |
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