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ditanya range?
jawab :
f(x) = 2x-1
f(-1) = 2(-1) -1 = -2-1 = -3
f(0) = 2(0) -1 = 0-1= -1
f(1) = 2(1)-1=2-1= 1
f(2) = 2(2)-1= 4-1= 3
jadi rangenya adalah {-3,-1,1,3}