3x + 9 < 0
2x² + 5x + 2 ≥ 0
1) 3x + 9 < 0
3x < -9
x < -3
2) 2x² + 5x + 2 ≥ 0
D = b² - 4ac = 25 - 4*2*2 = 9
x1 = (-5 + 3)/4 = -2/4 = -1/2
x2 = (-5 - 3)/4 = -8/4 = -2
2*(x + 1/2)(x + 2) ≥ 0
далее во вложении.
3x + 9 < 0
2x² + 5x + 2 ≥ 0
1) 3x + 9 < 0
3x < -9
x < -3
2) 2x² + 5x + 2 ≥ 0
D = b² - 4ac = 25 - 4*2*2 = 9
x1 = (-5 + 3)/4 = -2/4 = -1/2
x2 = (-5 - 3)/4 = -8/4 = -2
2*(x + 1/2)(x + 2) ≥ 0
далее во вложении.