Question
Answer
$$(-2i)\cdot5i(-i)=-10i$$
Explanation
| $$ \begin{aligned}(-2i)\cdot5i(-i)& \xlongequal{ }-10i^2(-i) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}10(-i) \xlongequal{ } \\[1 em] & \xlongequal{ }-10i\end{aligned} $$ | |
| ① | $$ -10i^2 = -10 \cdot (-1) = 10 $$ |
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