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    				| 1. | Factorise : 3a2b - 12a2 - 9b + 36 | 
| Answer» 3a2b - 12a2 - 9b + 36 = 3a2(b - 4) - 9(b - 4) = (b - 4) (3a2 - 9) = (b - 4) 3(a2 - 3) = 3(b - 4) (a2 - 3) | |