This problem:

Find all solutions of the equation and express them in the forma+bi.

x^2 +2/5x +5 =0

It is confusing me, since the answer shows as something that I don't know how to get to using the methods I know.

The answer is -1/5 + or - 2/1 X 31^1/2i

The 31 is raised to the 1/2 Power. I don't understand that. I must have forgot something from algebra dealing with that. Could someone tell me how that answer is gotten?

Thanks.