Question
Answer
$$4r\cdot3-4i=-4i+12r$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}4r\cdot3-4i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}12r-4i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-4i+12r\end{aligned} $$ | |
| ① | $$ 4 r \cdot 3 = 12 r $$ |
| ② | Combine like terms: $$ -4i+12r = -4i+12r $$ |
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