Question
Answer
$$5i\cdot3i=-15$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}5i\cdot3i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}15i^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-15\end{aligned} $$ | |
| ① | $$ 5 i \cdot 3 i = 15 i^{1 + 1} = 15 i^2 $$ |
| ② | $$ 15i^2 = 15 \cdot (-1) = -15 $$ |
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