Should have for the above.Originally Posted bykingkaisai2

You should be able to do the above now.Sketch and argand diagram showing the point representing the complex number u.

I presume that this last should be , which is a circleShow on the same diagram the locus of the complex number z such that [z-u]=2. Give a thorough description would be good.

of radius centred at .

This is now just a bit of geometry (look like orFind the greatest value of argument.

to me, but I haven't checked in detail)

RonL