Factorise:9a(3a − 5b) − 12a2(3a − 5b)
We have:
$9 a(3 a-5 b)-12 a^{2}(3 a-5 b)=(3 a-5 b)\left(9 a-12 a^{2}\right)=3 a(3 a-5 b)(3-4 a)$
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