b) 64x^3 – 144x^2y + 108xy^2 – 27y^3.
b) 64x3 – 144x2y + 108xy2 – 27y3.
b) 64x3 – 144x2y + 108xy2 – 27y3
= (4x)3 – 3 . (4x)2 . 3y + 3 . 4x . (3y)2 – (3y)3
= (4x – 3y)3.