Hi all,

I'm trying to work out the roots for the equation above. I've worked out one of them as being z = i, as z^3= i^3 = -i.

Wolfram Alpha gives

z = 1/2 (sqrt(3)-i) and z = 1/2 (-sqrt(3)-i)

as the other answers, but I'm unsure how they arrived at this?

Thanks.