Question
Answer
$$3i\cdot3i(-5i)=45i$$
Explanation
| $$ \begin{aligned}3i\cdot3i(-5i)& \xlongequal{ }9i^2(-5i) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-9(-5i) \xlongequal{ } \\[1 em] & \xlongequal{ }45i\end{aligned} $$ | |
| ① | $$ 9i^2 = 9 \cdot (-1) = -9 $$ |
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