Question
Answer
$$2-15i-(4+5i)=-20i-2$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}2-15i-(4+5i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2-15i-4-5i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-20i-2\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 4+5i \right) = -4-5i $$ |
| ② | Combine like terms: $$ \color{blue}{2} \color{red}{-15i} \color{blue}{-4} \color{red}{-5i} = \color{red}{-20i} \color{blue}{-2} $$ |
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