Question
Answer
$$7i-2+3i^2-i=6i-5$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}7i-2+3i^2-i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}7i-2-3-i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}6i-5\end{aligned} $$ | |
| ① | $$ 3i^2 = 3 \cdot (-1) = -3 $$ |
| ② | Combine like terms: $$ \color{blue}{7i} \color{red}{-2} \color{red}{-3} \color{blue}{-i} = \color{blue}{6i} \color{red}{-5} $$ |
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