Question
Answer
$$(2+3i)\cdot4i=8i-12$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(2+3i)\cdot4i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}8i+12i^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}8i-12\end{aligned} $$ | |
| ① | $$ \left( \color{blue}{2+3i}\right) \cdot 4i = 8i+12i^2 $$ |
| ② | $$ 12i^2 = 12 \cdot (-1) = -12 $$ |
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