Question
Answer
$$-2i\cdot2i=4$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-2i\cdot2i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-4i^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}4\end{aligned} $$ | |
| ① | $$ 2 i \cdot 2 i = 4 i^{1 + 1} = 4 i^2 $$ |
| ② | $$ -4i^2 = -4 \cdot (-1) = 4 $$ |
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