Answer
$$2x(2x+5x)-(12x+2x\cdot2)=14x^2-16x$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}2x(2x+5x)-(12x+2x\cdot2)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2x\cdot7x-(12x+4x) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}2x\cdot7x-16x \xlongequal{ } \\[1 em] & \xlongequal{ }14x^2-16x\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{2x} + \color{blue}{5x} = \color{blue}{7x} $$$$ 2 x \cdot 2 = 4 x $$ |
| ② | Combine like terms: $$ \color{blue}{12x} + \color{blue}{4x} = \color{blue}{16x} $$ |
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