Question
Answer
$$(2i)^2-6i+9-2i=4i^2-8i+9$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(2i)^2-6i+9-2i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4i^2-6i+9-2i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}4i^2-8i+9\end{aligned} $$ | |
| ① | $$ \left( 2i \right)^2 = 2^2i^2 = 4i^2 $$ |
| ② | Combine like terms: $$ 4i^2 \color{blue}{-6i} +9 \color{blue}{-2i} = 4i^2 \color{blue}{-8i} +9 $$ |
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