Question
Answer
$$21i^2+32i+12=32i-9$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}21i^2+32i+12& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-21+32i+12 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}32i-9\end{aligned} $$ | |
| ① | $$ 21i^2 = 21 \cdot (-1) = -21 $$ |
| ② | Combine like terms: $$ 32i \color{blue}{-21} + \color{blue}{12} = 32i \color{blue}{-9} $$ |
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