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