Question
Answer
$$7+3i-(-9+i)=2i+16$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}7+3i-(-9+i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}7+3i+9-i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}2i+16\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( -9+i \right) = 9-i $$ |
| ② | Combine like terms: $$ \color{blue}{7} + \color{red}{3i} + \color{blue}{9} \color{red}{-i} = \color{red}{2i} + \color{blue}{16} $$ |
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