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Daerah asal = {-1, 0, 1, 2}
Daerah hasil dari -1 ~> f(x) = 2x - 1
f(-1) = 2(-1) - 1
= -2 - 1
= -3
Daerah hasil dari 0 ~> f(x) = 2x - 1
f(0) = 2(0) - 1
= 0 - 1
= -1
Daerah hasil dari 1 ~> f(x) = 2x - 1
f(1) = 2(1) - 1
= 2 - 1
= 1
Daerah hasil dari 2 ~> f(x) = 2x - 1
f(2) = 2(2) - 1
= 4 - 1
= 3
Jadi daerah hasilnya = {-3, -1, 1, 3}