Помогите решить плиз (2х-1)^2-(х-1)(х+7)≤5
(2x-1)² - (x-1)(x+7) ≤ 5 (2x-1)² ≤ 5 (2x-1)(2x-1) ≤ 5 4x² - 4x + 1 ≤ 5 4x² - 4x - 4 ≤ 0 x² - x - 1 ≤ 0 x(x-1) ≤ 1 x ≤ 1 x - 1 ≤ 1 x ≤ 2 [1;2] - (x-1)(x+7) ≤ 5 (x-1)(x+7) _> 5 x-1 _> 5 x _> 6 x+7 _> 5 x _> -2 [-2;5]