Question
Answer
$$5i(-3i)=15$$
Explanation
| $$ \begin{aligned}5i(-3i)& \xlongequal{ }-15i^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}15\end{aligned} $$ | |
| ① | $$ -15i^2 = -15 \cdot (-1) = 15 $$ |
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