Question
Answer
$$-17-15i-(-20i-18)=5i+1$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-17-15i-(-20i-18)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-17-15i+20i+18 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}5i+1\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( -20i-18 \right) = 20i+18 $$ |
| ② | Combine like terms: $$ \color{blue}{-17} \color{red}{-15i} + \color{red}{20i} + \color{blue}{18} = \color{red}{5i} + \color{blue}{1} $$ |
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