Tentukan invers fungsi x dari : F(x) = x^2 - 2x + 1

misal dg rumus
f^-1(x) = [-b ± √(4ax + b² - 4ac)] / 2a
= [2 ± √(4x + (-2)² - 4(1)(1))] / 2(1)
= [2 ± √(4x + 4 - 4)] / 2
= [2 ± 2√x] / 2
f^-1(x) = 1 ± √x