Question
Answer
$$(-2-i)\cdot(4+1)=-5i-10$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(-2-i)\cdot(4+1)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}(-2-i)\cdot5 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-10-5i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}-5i-10\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{4} + \color{blue}{1} = \color{blue}{5} $$ |
| ② | $$ \left( \color{blue}{-2-i}\right) \cdot 5 = -10-5i $$ |
| ③ | Combine like terms: $$ -5i-10 = -5i-10 $$ |
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