Question

factorise 9a (3a - 5b) - 12a2 (3a - 5b) ​

Answer 1

$\begin{gathered} 9a(3a-5b) - 12a^{2}(3a-5b) \\= 3\times 3a(3a-5b) - 4a\times 3a(3a-5b) \\= 3a(3a-5b)( 3-4a) \end{gathered}$

Therefore.,

$\begin{gathered} \bold\red{ Factors \:of \:9a(3a-5b) - 12a^{2}(3a-5b)}\\\green {= 3a(3a-5b)( 3-4a)} \end{gathered}$