x^2-5x-1=0
x^2-1=5x
(x^2-1)^2=25x^2
x^4-2x^2+1=25x^2
x^4-2x^2+1+3x^2=25x^2+3x^2
x^4+x^2+1=28x^2
x^2/(x^4+x^2+1)=1/28