I simply cannot - repeat cannot - believe what I've just read above! I am truly and totally dumbfounded!
EVERY square root MUST have TWO values of the form + a and - a, commonly written as ±a.
That is because (-a)² = a² and (+a) = a² also.
Are you disagreeing with that fundamental property of square roots? Because to me, you certainly seem to be doing that!
I anxiously await your reply.
Al / Skywave.