f(x)=11x^2+8x+5=11x^2+8x-6=0(x+9)(x-1)=0x=-9, x=1
f(x)<=-11x^2+8x+5<=-11x^2+8x+16<=0(x+4)^2<=0(x+4)<=0x<=-4
f(x)=-10x^2+8x+5=-10x^2+8x+15=0(x+3)(x+5)=0x=-3, x=-5
f(x)>-10x^2+8x+5>-10x^2+8x+15>0(x+3)(x+5)>0x<-5 or x>-3
f(x)=11
x^2+8x+5=11
x^2+8x-6=0
(x+9)(x-1)=0
x=-9, x=1
f(x)<=-11
x^2+8x+5<=-11
x^2+8x+16<=0
(x+4)^2<=0
(x+4)<=0
x<=-4
f(x)=-10
x^2+8x+5=-10
x^2+8x+15=0
(x+3)(x+5)=0
x=-3, x=-5
f(x)>-10
x^2+8x+5>-10
x^2+8x+15>0
(x+3)(x+5)>0
x<-5 or x>-3