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and so is x^2=-64 with roots = -8i or 8i

and i notice that the sum of roots = 0 (msut inculde non real --> complex number)

is this becasue of the rule of polynomial --> -b/a = sum of roots

for this case b always =0 so -b/a = 0 ?

or (there is nothing to do with this and my example are just a fulke) once complex number is incolved then polynoimial rules can not apply?