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