| $$ \begin{aligned}6x^3(4x^5+3x-6)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}24x^8+18x^4-36x^3\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{6x^3} $ by $ \left( 4x^5+3x-6\right) $ $$ \color{blue}{6x^3} \cdot \left( 4x^5+3x-6\right) = 24x^8+18x^4-36x^3 $$ |