Solve
$9 a (3 a^{2} - 5 b) - 12 a^{2} (3 a - 5 b)$

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Solution

Given that,
$\begin{matrix} 9 a (3 a^{2} - 5 b) - 12 a^{2} (3 a - 5 b) = 27 a^{3} - 45 a b - 36 a^{3} + 60 a^{2} b = - 9 a^{3} + 60 a^{2} b - 45 a b \end{matrix}$
$= 9 a^{3} - 60 a^{2} b + 45 a b$

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3 a + 5 b = 26 a + 5 b = 22

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