Question
Answer
$$11-8i-(2-8i)=9$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}11-8i-(2-8i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}11-8i-2+8i \xlongequal{ } \\[1 em] & \xlongequal{ }11 -\cancel{8i}-2+ \cancel{8i} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}9\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 2-8i \right) = -2+8i $$ |
| ② | Combine like terms: $$ \color{blue}{11} \, \color{red}{ -\cancel{8i}} \, \color{blue}{-2} + \, \color{red}{ \cancel{8i}} \, = \color{blue}{9} $$ |
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