Question
Answer
$$2\cdot2i^3=-4i$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}2\cdot2i^3& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4i^3 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-4i\end{aligned} $$ | |
| ① | $$ 2 \cdot 2 i^3 = 4 i^{3} $$ |
| ② | $$ 4i^3 = 4 \cdot \color{blue}{i^2} \cdot i =
4 \cdot ( \color{blue}{-1}) \cdot i =
-4 \cdot \, i $$ |
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