$$ \begin{aligned}2n(-3mn+5m)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-6mn^2+10mn\end{aligned} $$ | |
① | Multiply $ \color{blue}{2n} $ by $ \left( -3mn+5m\right) $ $$ \color{blue}{2n} \cdot \left( -3mn+5m\right) = -6mn^2+10mn $$ |