Question
Answer
$$-13-2i-(-21-10i)=8i+8$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-13-2i-(-21-10i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-13-2i+21+10i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}8i+8\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( -21-10i \right) = 21+10i $$ |
| ② | Combine like terms: $$ \color{blue}{-13} \color{red}{-2i} + \color{blue}{21} + \color{red}{10i} = \color{red}{8i} + \color{blue}{8} $$ |
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