Answer
$$2x(3x^2+4-3x^2)=8x$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}2x(3x^2+4-3x^2)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2x\cdot4 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}8x\end{aligned} $$ | |
| ① | Combine like terms: $$ \, \color{blue}{ \cancel{3x^2}} \,+4 \, \color{blue}{ -\cancel{3x^2}} \, = 4 $$ |
| ② | $$ 2 x \cdot 4 = 8 x $$ |
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