$$ \begin{aligned}6(2v^2-2v)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}12v^2-12v\end{aligned} $$ | |
① | Multiply $ \color{blue}{6} $ by $ \left( 2v^2-2v\right) $ $$ \color{blue}{6} \cdot \left( 2v^2-2v\right) = 12v^2-12v $$ |