(x^2-y^2)/(x-y) - (x^3-y^3)/(x^2-y^2)

Question

(x^2-y^2)/(x-y) - (x^3-y^3)/(x^2-y^2)

Answer 1

(x-y)(х+y)/(х-y)- (x-y)(х^2+xy+y^2)/( x-y)(х+y) = (х+y)-  (х^2+xy+y^2)/(х+y) =(2х^2+3xy+2y^2)/x+y