F : x -> x2 +2x Daerah asal {0,1,2,3} Please jawab yh Soal ny penting bngt

f(x) = x2 + 2x

f(0) = (0)2 + 2(0)
            0  + 0 = 0
f(1) =  (1)2 + 2(1)
                2 + 2 = 4
f(2) =   (2)2 + 2(2)
               4 + 4 = 8
f(3) = (3)2  + 2(3)
            6   + 6 + 12

R= {0,4,8,12}