P(x) = 5X^4 - 11X^3 + 16X^2 - 11X + 5 = 0
Divide both sides by x^2 and we get
5x^2 - 11x + 16 - 11/x + 5/x^2 = 0
5(x^2 + 1/x^2) -11(x+1/x) +16 =0
[Now if u = x + 1/x, then x^2 + 1/x^2 = u^2 - 2]
so the above equation becomes 5(u^2 - 2) -11u + 16 = 0
5u^2 - 11u + 6 = 0
(5u - 6)...