Answer :
answer is 1/4
using
(a+b)^2 = a^2 + 2 a b + b^2
so (x + 1/2)^2 = x^2 + 2 (1/2) (x) + 1/4 = x^2 + x + 1/4
using
(a+b)^2 = a^2 + 2 a b + b^2
so (x + 1/2)^2 = x^2 + 2 (1/2) (x) + 1/4 = x^2 + x + 1/4