( x - y )³= beserta caranya!!!

x^3 - 3x^2y + 3 x y^2 - y^3
^ = pangkat

=(x-y)(x-y)(x-y)
=(x^2-2xy+y^2)(x-y)
=(x^3-2x^2y+2xy^2-x^2y+2xy^2-y^3)
=x^3-3y^2-3x^2+2y+4xy^2