Question
Answer
$$7i^2-4i=-4i-7$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}7i^2-4i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-7-4i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-4i-7\end{aligned} $$ | |
| ① | $$ 7i^2 = 7 \cdot (-1) = -7 $$ |
| ② | Combine like terms: $$ -4i-7 = -4i-7 $$ |
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