Question
Answer
$$-10-3i-(2+10i)=-13i-12$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-10-3i-(2+10i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-10-3i-2-10i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-13i-12\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 2+10i \right) = -2-10i $$ |
| ② | Combine like terms: $$ \color{blue}{-10} \color{red}{-3i} \color{blue}{-2} \color{red}{-10i} = \color{red}{-13i} \color{blue}{-12} $$ |
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