Question

(ii) 9 pqr (2p2 q - 3q2 r)​

Answer 1

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Here is your answer

\begin{gathered} = 9pqr(2 {p}^{2} q - 3 {q}^{2} r) \\ \\ = 18 {p}^{3} {q}^{2} r - 27p { {q}^{3} }^{} {r}^{2} \end{gathered}=9pqr(2p2q−3q2r)=18p3q2r−27pq3r2

thank you