√(x^2+8x-9)<√11x^2+8x-9<11x^2+8x-20<0(x+10(x-2)<0-10<x<2ОДЗ: x^2+8x-9≥0 (x+9)(x-1)≥0 x≤-9 x≥1 => x=(-10;-9]U[1;2)
√(x^2+8x-9)<√11
x^2+8x-9<11
x^2+8x-20<0
(x+10(x-2)<0
-10<x<2
ОДЗ: x^2+8x-9≥0
(x+9)(x-1)≥0
x≤-9 x≥1
=> x=(-10;-9]U[1;2)