Answer
$$i(-6i)(-7i)=-42i$$
Explanation
| $$ \begin{aligned}i(-6i)(-7i)& \xlongequal{ }-6i^2(-7i) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}6(-7i) \xlongequal{ } \\[1 em] & \xlongequal{ }-42i\end{aligned} $$ | |
| ① | $$ -6i^2 = -6 \cdot (-1) = 6 $$ |
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