Question
Answer
$$6i-(9-7i)=13i-9$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}6i-(9-7i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}6i-9+7i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}13i-9\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 9-7i \right) = -9+7i $$ |
| ② | Combine like terms: $$ \color{blue}{6i} -9+ \color{blue}{7i} = \color{blue}{13i} -9 $$ |
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