c) 27x^3 – y^3.
c) 27x3 – y3.
c) 27x3 – y3 = (3x)3 – y3 = (3x + y)(3x – y).
c) 27x3 – y3.
c) 27x3 – y3 = (3x)3 – y3 = (3x + y)(3x – y).