27 - 125a3 - 135a + 225a227 - 125a3 - 135a + 225a2= (3)3 - (5a)3 - 3(3)(5a)(3 - 5a)= (3 - 5a)3 | Using Identity VII= (3 - 5a)(3 - 5a)(3 - 5a)
Factorise each of the following: