3x + 9 lt; 02x² + 5x + 2 ≥ 01) 3x + 9 lt; 03x lt; -9x lt; -32) 2x² + 5x + 2 ≥ 0D = b² - 4ac = 25 - 4*2*2 = 9x1 = (-5 + 3)/4 = -2/4 = -1/2x2 = (-5 - 3)/4 = -8/4 = -22*(x + 1/2)(x + 2) ≥ 0далее во вложении.