polynomials?

Question

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

i use a calculator but my answer come out wrong why?help me with these problmes please

Answer 1

using a³ + b³ = (a+b)(a² - ab + b²)


x³ + y³ / (x-y)= (x+y)(x² - xy + y²) / (x-y)