If f(x)=x+2x−1+x−2x−1f(x) = \sqrt{x + 2\sqrt{x-1}} + \sqrt{x - 2\sqrt{x-1}}f(x)=x+2x−1+x−2x−1, simplify f(x)f(x)f(x) for x≥2x \ge 2x≥2.
222
2x−12\sqrt{x-1}2x−1
2x2\sqrt{x}2x
000