Answer
$$3a^4(5a^2-a+4)=15a^6-3a^5+12a^4$$
Explanation
| $$ \begin{aligned}3a^4(5a^2-a+4)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}15a^6-3a^5+12a^4\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{3a^4} $ by $ \left( 5a^2-a+4\right) $ $$ \color{blue}{3a^4} \cdot \left( 5a^2-a+4\right) = 15a^6-3a^5+12a^4 $$ |
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