$$ \begin{aligned}6(5p^3-6p)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}30p^3-36p\end{aligned} $$ | |
① | Multiply $ \color{blue}{6} $ by $ \left( 5p^3-6p\right) $ $$ \color{blue}{6} \cdot \left( 5p^3-6p\right) = 30p^3-36p $$ |