√x -(1/√x)=1
[√x -(1/√x)]^2=1
x -2 +1/x =1
x +1/x =3
(x +1/x)^2 =9
x^2+ 2 + 1/x^2 =81
x^2+1/x^2 - 79 =0
x^2+1/x^2 +18=97