Question
Answer
$$-2i+4-(4+4i)=-6i$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-2i+4-(4+4i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-2i+4-4-4i \xlongequal{ } \\[1 em] & \xlongequal{ }-2i+ \cancel{4} -\cancel{4}-4i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-6i\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 4+4i \right) = -4-4i $$ |
| ② | Combine like terms: $$ \color{blue}{-2i} + \, \color{red}{ \cancel{4}} \, \, \color{red}{ -\cancel{4}} \, \color{blue}{-4i} = \color{blue}{-6i} $$ |
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