f '(x) = (2x(2x-1) - 2(x²+2)) / (2x-1)² f '(x) = 0 (2x-1) ≠0 2x(2x-1) - 2(x²+2) = 0 4x² - 2x - 2x² - 4 = 0 2x² - 2x - 4 = 0 x₁ = -1 x₂ = 2 ++++++++ [-1] ------(1/2)--- [2] +++++++ Xmax = -1 Xmin = 2