voo: √x² - 2x + 1 ≥ 2

Eta: Dziedzina: x² -2x +1 ≥0 <=> (x -1)² ≥0 <=> x€ R √(x -1)² = I x -1I to I x - 1 I ≥ 2 <=> x -1 ≥ 2 v x - 1 ≤ - 2 x ≥ 3 v x ≤ - 1 x € ( -∞, - 1> U < 3,∞)