factorise the following
12a^2-ab-20b^2
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12a²-ab-20b²
12a²+15ab-16ab-20b²
3a(4a+5b)-4b(4a+5b)
(4a+5b)(3a-4b)
12a²+15ab-16ab-20b²
3a(4a+5b)-4b(4a+5b)
(4a+5b)(3a-4b)
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