Q.

Product of perpendiculars from the foci of x24-y29=1 to y=mx+4m2-9 where m>32 is

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a

3613

b

9

c

3

d

4

answer is D.

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Detailed Solution

Given hyperbola x24-y29=1  a2=4, b2=9 Given line y=mx+4m2-9 since it is tangent to the given hyperbola then product of perpendiculars from foci to any tangent to the hyperbola =b2                                                                                                                                                                                                         =9    

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