(x + 19)(x - 3) - (2x - 1)(2x + 1) ≥ x - 38

x² + 19x - 3x - 57 - 4x² + 1 ≥ x - 38

-3x² + 15x - 18 ≥ 0

x² - 5x + 6 ≤ 0

D = 25 - 4*6 = 1

x1 = (5 + 1)/2 = 3

x2 = (5 - 1)/2 = 2

(x - 2)(x - 3) ≤ 0

Далее во вложении.