$$ \begin{aligned}41x(x+8)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}41x^2+328x\end{aligned} $$ | |
① | Multiply $ \color{blue}{41x} $ by $ \left( x+8\right) $ $$ \color{blue}{41x} \cdot \left( x+8\right) = 41x^2+328x $$ |