Question
Answer
$$7i(-4i)\cdot2i=56i$$
Explanation
| $$ \begin{aligned}7i(-4i)\cdot2i& \xlongequal{ }-28i^2\cdot2i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}28\cdot2i \xlongequal{ } \\[1 em] & \xlongequal{ }56i\end{aligned} $$ | |
| ① | $$ -28i^2 = -28 \cdot (-1) = 28 $$ |
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