Question
Answer
$$(-8i)\cdot5i\cdot3i=120i$$
Explanation
| $$ \begin{aligned}(-8i)\cdot5i\cdot3i& \xlongequal{ }-40i^2\cdot3i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}40\cdot3i \xlongequal{ } \\[1 em] & \xlongequal{ }120i\end{aligned} $$ | |
| ① | $$ -40i^2 = -40 \cdot (-1) = 40 $$ |
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