# Math Help - Factor this expression to a+b

1. ## Factor this expression to a+b

How would you factor the following to a+b?

(a^3 + b^3)/(a^2 -ab +b^2)

I can tell, through substitution, that it's a+b, but I can't figure out how to factor it.

2. $x^3 + y^3 =(x+y)(x^2 -xy + y^2)$

3. Thanks!