Question
Answer
$$3i\cdot(15+2i)=45i-6$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}3i\cdot(15+2i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}45i+6i^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}45i-6\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{3i} $ by $ \left( 15+2i\right) $ $$ \color{blue}{3i} \cdot \left( 15+2i\right) = 45i+6i^2 $$ |
| ② | $$ 6i^2 = 6 \cdot (-1) = -6 $$ |
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