Question
Answer
$$-4x\cdot3i^2=12x$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-4x\cdot3i^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-12i^2x \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}12x\end{aligned} $$ | |
| ① | $$ 4 x \cdot 3 i^2 = 12 i^{2} x $$ |
| ② | $$ -12i^2 = -12 \cdot (-1) = 12 $$ |
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