Answer
$$9p^3q^4(3p^3-5q)=27p^6q^4-45p^3q^5$$
Explanation
| $$ \begin{aligned}9p^3q^4(3p^3-5q)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}27p^6q^4-45p^3q^5\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{9p^3q^4} $ by $ \left( 3p^3-5q\right) $ $$ \color{blue}{9p^3q^4} \cdot \left( 3p^3-5q\right) = 27p^6q^4-45p^3q^5 $$ |
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