Question
Answer
$$(-5+5i)\cdot4=20i-20$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(-5+5i)\cdot4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-20+20i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}20i-20\end{aligned} $$ | |
| ① | $$ \left( \color{blue}{-5+5i}\right) \cdot 4 = -20+20i $$ |
| ② | Combine like terms: $$ 20i-20 = 20i-20 $$ |
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