Factorise :6a2 - 3a2b - bc2 + 2c2
6a2 - 3a2b - bc2 + 2c2
= 6a2 - 3a2b + 2c2 - bc2
= 3a2 (2 - b) + c2 (2 - b)
= (2 - b) (3a2 + c2)
