Jawabanmu

2014-06-03T22:40:03+07:00
F(x)= x² - 2x + 1
y = (x - 1)
²
x - 1 = ± √y
x = 1 ± √y
f^-1(x) = 1 ± √x
f^-1(4) = 1 ± √4 = 1 ± 2 = 3 atau -1