Answer
$$3xy^2(4x^3+2x^2)=12x^4y^2+6x^3y^2$$
Explanation
| $$ \begin{aligned}3xy^2(4x^3+2x^2)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}12x^4y^2+6x^3y^2\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{3xy^2} $ by $ \left( 4x^3+2x^2\right) $ $$ \color{blue}{3xy^2} \cdot \left( 4x^3+2x^2\right) = 12x^4y^2+6x^3y^2 $$ |
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