Factorise :
6a2 - 3a2b - bc2 + 2c2
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= 3a2(2 - b) - c2(b - 2)
= 3a2(2 - b) + c2(2 - b)
= (2 - b)(3a2 + c2)
Hence,6a2 - 3a2b - bc2 + 2c2 = (2 - b)(3a2 + c2)
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3x5 - 6x4 - 2x3 + 4x2 + x - 2
-x2y - x + 3xy + 3
3a2b - 12a2 - 9b + 36
x2 - (a - 3)x - 3a