Answer
$$10x^2(3x^3-9x^2+12x)=30x^5-90x^4+120x^3$$
Explanation
| $$ \begin{aligned}10x^2(3x^3-9x^2+12x)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}30x^5-90x^4+120x^3\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{10x^2} $ by $ \left( 3x^3-9x^2+12x\right) $ $$ \color{blue}{10x^2} \cdot \left( 3x^3-9x^2+12x\right) = 30x^5-90x^4+120x^3 $$ |
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