Question
Answer
$$-18+10i-(1+13i)=-3i-19$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-18+10i-(1+13i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-18+10i-1-13i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-3i-19\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 1+13i \right) = -1-13i $$ |
| ② | Combine like terms: $$ \color{blue}{-18} + \color{red}{10i} \color{blue}{-1} \color{red}{-13i} = \color{red}{-3i} \color{blue}{-19} $$ |
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