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Question

The equation ¯¯bz+¯¯¯zb=c where b is a non-zero complex constant and c is real, represents a

A
circle
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B
straight line
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C
ellipse
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D
hyperbola
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Solution

The correct option is B straight line

Equation ¯¯bz+¯¯¯zb=c

Let z=x+iy,& b=b1+ib2

where x,y,b1,b2 are real. Then the given equation becomes

(b1ib2)(x+iy)+(b1+ib2)(xiy)=c

2b1x+2b2y=c

which is equation of a straight line.


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