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Maka daerah hasil :
f(x) = 2x -1
f(-1)= 2.-1 -1
= -2 -1 = -3
f(x) = 2x -1
f(0) = 2.0 -1
= 0 -1 = -1
f(x) = 2x -1
f(1) = 2.1 -1
= 2-1 = 1
f(x) = 2x -1
f(2)= 2.2 -1
= 4-1 = 3
maka daerah hasil {-3,-1,1,3}