View Full Version : Complex numbers - loci
IceMan
31st May 2006, 06:00 PM
struggling with loci
What is the locus of
1) |z-3-2i|=|z+5-6i|
2) |6z-1|=13
where z is a complex number
KatieB
31st May 2006, 11:49 PM
1) |z-3-2i|=|z+5-6i|
Any thing of the form |z-a|=|z-b| represents the perpendicular bisector of a and b
|z-3-2i|=|z+5-6i| should be written in this form as |z-(3+2i)|=|z-(-5+6i)|
so this is the perpendicular bisector of (3+2i) and (-5+6i)
2)
|6z-1|=13
Again anything of the form |z-a|=r represents a circle radius r and centre a
|6z-1|=13
|6(z-1/6)|=13
6|z-1/6|=13
|z-1/6|=13/6
Circle centre (-1/6,0) radius 13/6
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