Question
Answer
$$5ii(-2i)=10i$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}5ii(-2i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}5i^2(-2i) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-5(-2i) \xlongequal{ } \\[1 em] & \xlongequal{ }10i\end{aligned} $$ | |
| ① | $$ 5 i i = 5 i^{1 + 1} = 5 i^2 $$ |
| ② | $$ 5i^2 = 5 \cdot (-1) = -5 $$ |
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