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x+4 = y
x = y - 4
jadi f(x) = x-4
b. misal f^-1(x) = y
3x - 1 = y
3x = y + 1
x = (y+1)/3
jadi f(x) = (x+1)/3
c. misal f^-1(x) = y
x + 1√3 = y
x = y - 1√3
jadi f(x) = x - 1√3
Kalau menurutku sih gitu.. Ma'af kalau salah...