f(x)= 3/x+2-square root x-3
if f(x) = 0 (3/x+2)^2=x-3(9/x^2+4x+4)=x-39=(x-3)(x^2+4x+4)9=x^3+x^2-8x-120=x^3 +x^2-8x-21put it in the quadratic formulax= 3.3182