Answer
$$3+5i-(-2-4i)=9i+5$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}3+5i-(-2-4i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3+5i+2+4i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}9i+5\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( -2-4i \right) = 2+4i $$ |
| ② | Combine like terms: $$ \color{blue}{3} + \color{red}{5i} + \color{blue}{2} + \color{red}{4i} = \color{red}{9i} + \color{blue}{5} $$ |
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