a)The set M= {$\displaystyle z \in C : {z^4}$ + 8 - 8 $\displaystyle \sqrt{3}$i =0 }

Charackterize the set М and point it's the Gauss plane

b)Where exactly is the Gauss plane image from the number z $\displaystyle \in$ for wich is valid:

$\displaystyle \left|\frac{z-1}{z-i}\right|$= 1

Thanks,

Kukov