Question
Answer
$$21-6i-(13+25i)=-31i+8$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}21-6i-(13+25i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}21-6i-13-25i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-31i+8\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 13+25i \right) = -13-25i $$ |
| ② | Combine like terms: $$ \color{blue}{21} \color{red}{-6i} \color{blue}{-13} \color{red}{-25i} = \color{red}{-31i} + \color{blue}{8} $$ |
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