Question
Answer
$$18i^2+57i+30=57i+12$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}18i^2+57i+30& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-18+57i+30 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}57i+12\end{aligned} $$ | |
| ① | $$ 18i^2 = 18 \cdot (-1) = -18 $$ |
| ② | Combine like terms: $$ 57i \color{blue}{-18} + \color{blue}{30} = 57i+ \color{blue}{12} $$ |
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