a. Dominio = {0,1,2,3}\left\{0,1,2,3\right\}{0,1,2,3}, Rango={−3,−2,−1,0,1,2,3}\left\{-3,-2,-1,0,1,2,3\right\}{−3,−2,−1,0,1,2,3}.
b. No, no es función.