Question

(Complex numbers) Find all \[z \in C\](C = complex numbers) which satisfy (conjugate)z-z²
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I'm not sure what else to do than use Complex n-th roots so
\[z=\sqrt{r}(\cos(\frac{\theta+2k{\pi}}{2})-i*\sin(\frac{\theta+2k{\pi}}{2}))\] for k=0,1
(And then a substitute for k=0, and k=1 to find both z)

Is there a more specific answer I can get?