a. Dominio = {−3,−2,−1,0,1,2,3}\left\{-3,-2,-1,0,1,2,3\right\}{−3,−2,−1,0,1,2,3}, Rango={0,1,4,9}\left\{0,1,4,9\right\}{0,1,4,9}.
b. Sí, es función.