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Question

If |z4i||z+4i|=2 then the locus of z is

A
Circle
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B
Pair of lines
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C
Ellipse
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D
Hyperbola
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Solution

The correct option is D Hyperbola
|z4i||z+4i|=2
Clearly |4i(4i)|=|8i|=82
Hence given expression represents a Hyperbola.
Note: The equation |zz1||zz2|=k
represents a Hyperbola if |z1z2|k

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