I have no idea what a locus means so

The complex number u is given by u=(7+4i)/(3-2i). In the form x+yi, x=i, y=2

Sketch and argand diagram showing the point representing the complex number u. Show on the same diagram the locus of the complex number z such that [z-u]=2. Give a thorough description would be good.

Find the greatest value of argument. Urgent.