(x-17)(x+5)≤4[latex] x^{2} [/latex]-76

(x-17)(x+5)≤4x²-76 x²+5x-17x-85≤4x²-76 x²-12x-85-4x²+76≤0 -3x²-12x-9≤0 D2=(-6)²+3×(-9)=36-27=9 x1= -6+9\3= 1 x2=-6-9/3=-5