Factorise 9a(x-2y)^4-12a(x-2y)^3
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9a(x-2y)^4 - 12a(x-2y)^3
= (x-2y)^3 * (9a * (x-2y) + (12a * (-1))
= (x - 2y)^3 * (9ax - 18ay - 12a)
= (x - 2y)^3 * 3a(3x - 6y - 4)
= 3a(x - 2y)^3 * (3x - 6y - 4).
Hope this helps!
= (x-2y)^3 * (9a * (x-2y) + (12a * (-1))
= (x - 2y)^3 * (9ax - 18ay - 12a)
= (x - 2y)^3 * 3a(3x - 6y - 4)
= 3a(x - 2y)^3 * (3x - 6y - 4).
Hope this helps!
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