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