Factorise :
3a2b - 12a2 - 9b + 36
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= 3a2(b - 4) - 9(b - 4)
= (b - 4)(3a2 - 9)
= (b - 4)3(a2 - 3)
= 3(b - 4)(a2 - 3)
Hence, 3a2b - 12a2 - 9b + 3 = 3(b - 4)(a2 - 3)
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-x2y - x + 3xy + 3
6a2 - 3a2b - bc2 + 2c2
x2 - (a - 3)x - 3a
ab2 - (a - c) b - c