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