Question
Answer
$$(-6i)\cdot9i=54$$
Explanation
| $$ \begin{aligned}(-6i)\cdot9i& \xlongequal{ }-54i^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}54\end{aligned} $$ | |
| ① | $$ -54i^2 = -54 \cdot (-1) = 54 $$ |
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