x^2 - x + 3 = 0, (x - 2).(x - 3) ≥ 0, (x + 2).√(x - 3) = 0, (√x - 2)(√x + 3) = 0, (x + 2).(x - 3) = 0, (x - 2).(x - 3) ≤ 0, (x - 2)(x + 3) = 0, (x+2) (x-3) = 0, |x − 2| + |x + 3| = 0, (x+2).(x-3) = 0, (x + 2)(x - 3) = 0