Question

if x-y=2 ,then x3-y3

Answer 1

x3-y3 =  (x-y)3 + 3 x y (x-y)

==  (2)3+3 x y (2)

=  8+6 x y 

Answer 2

Given, x-y = 2
x^3 - y^3 =  (x-y)^3 + 3*x*y(x-y) = 2^3 + 3*x*y*2 = 8 + 6*x*y