ChallengeMedium ShareChallenge · Medium problemLet f(x)=x2−2xf(x)=x^2-2xf(x)=x2−2x. For how many real numbers xxx does f(f(x))=0f(f(x))=0f(f(x))=0?A111B222C333D444E666Check Show answer Walk through it step by step Practice more like this