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b. domain (-1, 0, 1, 2)
c. bayangan -1
f(-1)=2.(-1)-1 = -3
bayangan 0
f(0)=2.0-1=-1
d. f(1)=2.1-1=1
f(2)=2.2-1=3
e. (-3, -1, 1, 3)