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f(-2)= 4 - 2 (-2) =8
f(-1)= 4 - 2 (-1) =6
f(0)= 4 - 2 (0) =4
f(1)= 4 - 2 (1) =2
untuk x = -2 ⇒ 4 - 2(-2) = 4 - (-4) = 4 + 4 = 8
x = -1 ⇒ 4 - 2(-1) = 4 - (-1) = 4 + 1 = 5
x = 0 ⇒ 4 - 2(0) = 4 - 0= 4
x = 1 ⇒ 4 - 2(1) = 4 - 2 = 2
x = 2 ⇒ 4 - 2(2) = 4 - 4 = 0
jadi daerah hasilnya {0, 2, 4, 5, 8}