Question
Answer
$$15i-(12-11i)=26i-12$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}15i-(12-11i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}15i-12+11i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}26i-12\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 12-11i \right) = -12+11i $$ |
| ② | Combine like terms: $$ \color{blue}{15i} -12+ \color{blue}{11i} = \color{blue}{26i} -12 $$ |
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