Question
Answer
$$x\cdot3+4x\cdot2-12xx\cdot2+x-30=-24x^2+12x-30$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}x\cdot3+4x\cdot2-12xx\cdot2+x-30& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}3x+8x-24x^2+x-30 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}-24x^2+12x-30\end{aligned} $$ | |
| ① | $$ 4 x \cdot 2 = 8 x $$ |
| ② | $$ 12 x x \cdot 2 = 24 x^{1 + 1} = 24 x^2 $$ |
| ③ | Combine like terms: $$ \color{blue}{3x} + \color{red}{8x} -24x^2+ \color{red}{x} -30 = -24x^2+ \color{red}{12x} -30 $$ |
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