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Q.

The equation z+i||zi=k represents a hyperbola if

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a

–3 < k < 2

b

0 < k < 2

c

k > 2

d

k > 4

answer is C.

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Detailed Solution

z+i||zi=k Let p=z , A=i , B=-i then AB=i+i=2

Given equation become |PAPB|=k 

It represents a hyperbola then

  K<ABK<2 

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The equation ∥z+i|−|z−i∥=k represents a hyperbola if