x²+5x-17x-85-4x²+76≤0
-3x²-12x-9≤0
x²+4x+3≥0
D= 16-12= 4
x1= (-4+2)/2= -1
x2= (-4-2)/2= -3
(x+1)(x+3)≥0
x∈(-∞;-3]∪[-1;+∞)
x²+5x-17x-85-4x²+76≤0
-3x²-12x-9≤0
x²+4x+3≥0
D= 16-12= 4
x1= (-4+2)/2= -1
x2= (-4-2)/2= -3
(x+1)(x+3)≥0
x∈(-∞;-3]∪[-1;+∞)