Let s1 be the set spanned by the polynomials: x^3+x+1, x^3-3x^2+x-2, 2x^3-1. Let s2 be the set spanned by the polynomials: x^3-1, x^2+x+1. What is the intersection of s1 and s2? I really don't know where to begin, I don't know how to define these sets, s1 and s2. since i don't know what they are it is hard for me to find their intersection.