(x-2) ² - x- 8/ 3 + 1 ≤ (x-1) (x+1)

(x-2) ² - x- 8/ 3 + 1 ≤ (x-1) (x+1) x²-4x+4-x-5/3≤x²-1 -5x≤-1-4+5/3 -5x≤-5+5/3 -5x≤-15/3+5/3 -5x≤-10/3 /:(-5) x≥2/3 x∈<2/3;+∞>