Factorise-
x raise to 6 - y raise to 6
looks like diff of two squares..
(x^3)^2-(y^3)^2
(x^3-y^3)(x^3+y^3)
now go to
Factoring a Sum of Cubes:
a3 + b3 = (a + b)(a2 – ab + b2)
Factoring a Difference of Cubes:
a3 – b3 = (a – b)(a2 + ab + b2)