#The sum of the square of the modulus of the elements in the set is
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I would interpret the inequalities geometrically
The second inequality tells you that the distance from z to 5 is no more than the distance from z to 5i
Think about what set of points satisfies this
You should get that it's ||the set of points on the same side of the perpendicular bisector of the segment having endpoints (0,5) and (5,0) as (5,0)||
I'll let you finish it from here
Although the question isn't very well defined tbh
there's infinitely many such z
,w plot (x-1)^2 + y^2 \leq 1, (x-5)^2 + y^2 \leq x^2+(y-5)^2
thanks
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Fine lemme go to Desmos