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domain = {-1,0,1,2}
f(-1) = 2.-1 -1 = -3
f(0) = 2.0 - 1= -1
f(1)= 2.1 - 1 = 1
f(2) = 2.2 -1 = 3
daerah hasil ={-3, -1, 1, 3}