Question
Answer
$$15-7i-(19-5i)=-2i-4$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}15-7i-(19-5i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}15-7i-19+5i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-2i-4\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 19-5i \right) = -19+5i $$ |
| ② | Combine like terms: $$ \color{blue}{15} \color{red}{-7i} \color{blue}{-19} + \color{red}{5i} = \color{red}{-2i} \color{blue}{-4} $$ |
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