Question
Answer
$$4i\cdot5i=-20$$
Explanation
| $$ \begin{aligned}4i\cdot5i& \xlongequal{ }20i^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-20\end{aligned} $$ | |
| ① | $$ 20i^2 = 20 \cdot (-1) = -20 $$ |
This page was created using
Complex Expression calculator