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Question

Consider the equation az+b¯z+c=0, where a,b,c ϵ Z

If |a||b| , then z represents

A
Circle
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B
Ellipse
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C
Straight line
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D
One point
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Solution

The correct option is D One point
Given:
az+b¯z+c=0 , where a,b,c ϵ Z

az+b¯z+c=0(i)

Taking conjugate of (i), we get

¯a¯z+¯bz+¯c=0(ii)

Eliminating ¯z from (i) and (ii)

z=c¯ab¯c|b|2|a|2

If|a||b|, then z represents a point on the Argand plane.

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