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*f(-1) = 2(-1) - 1 = -2 -1 = -3
*f(0) = 2(0) - 1 = 0 -1 = -1
*f(1) = 2(1) - 1 = 2 - 1 = 1
*f(2) = 2(2) - 1 = 4 - 1 = 3
Jadi, daerah hasilnya adalah {-3, -1, 1, 3}