Maths Ext 2 Complex Numbers and Polynomials Qs (1 Viewer)

mreditor16

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aoc

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for the locus question in the complex numbers (Q4) i got that the exclusion is x^2+y^2 cant = 0, can this exclusion be simplified?
 

aoc

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so would i write z cant = 0 or x^2+y^2 cant = 0 (also why does the latter mean z cant =0)
 

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