Answer
$$2(x^2+4x+1)=2x^2+8x+2$$
Explanation
| $$ \begin{aligned}2(x^2+4x+1)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2x^2+8x+2\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{2} $ by $ \left( x^2+4x+1\right) $ $$ \color{blue}{2} \cdot \left( x^2+4x+1\right) = 2x^2+8x+2 $$ |
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