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= {-1,0,1,2}
f(x) = 2x.-1
f(-1) = 2 . -1 - 1 = -3
f(0) = 2 . 0 - 1 = -1
f(1) = 2 . 1 - 1 = 1
f(2) = 2 . 2 - 1 = 3
Kodomain(daerah hasil) = {(-1,-3),(0,-1),(1,1),(2,3)}
f(-1) = 2(-1) - 1 = - 3
f(0) = 2(0) - 1 = - 1
f(1) = 2(1) - 1 = 1
Daerah hasil = {- 3, - 1, 1}