Question
Answer
$$-(4-10i)+9i=19i-4$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-(4-10i)+9i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-4+10i+9i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}19i-4\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left(4-10i \right) = -4+10i $$ |
| ② | Combine like terms: $$ -4+ \color{blue}{10i} + \color{blue}{9i} = \color{blue}{19i} -4 $$ |
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