Log1/2 (x^2+2x-8)<=-4
-log2 (x^2+2x-8)=-4 log2 (x^2+2x-8)=4 log2 (x^2+2x-8)=log2 (16) x^2+2x-8=16 x^2+2x-24=0 D=4+96=100=10^2x x1=4 x2=-6