Answer
$$6x^3(3x^2+2xy+5y^2)=18x^5+12x^4y+30x^3y^2$$
Explanation
| $$ \begin{aligned}6x^3(3x^2+2xy+5y^2)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}18x^5+12x^4y+30x^3y^2\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{6x^3} $ by $ \left( 3x^2+2xy+5y^2\right) $ $$ \color{blue}{6x^3} \cdot \left( 3x^2+2xy+5y^2\right) = 18x^5+12x^4y+30x^3y^2 $$ |
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