log(1/2,x+1)-log(1/2,9x^2-1)+11/4
(x+1)/(9x^2-1)-1/4>0
(4x+4-9x^2+1)/[4(9x^2-1)]>0
(9x^2-4x-5)/(9x^2-1)0,x1/3
(9x^2-4x-5)