Q.

The point of contact of 9x+8y–11=0 to the hyperbola 3x2 4y2 = 11 is

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a

(3, 2)

b

(–3, –3) 

c

(3, 3)

d

(3, –2) 

answer is A.

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Detailed Solution

Given hyperbola 3x2-4y2=11 x2113-y2114=1  a2=113, b2=114 Given line 9x+8y-11=0 Compare with lx+my+n=0 l=9, m=8, n=-11  point of contact=-a2ln,b2mn                                  =-113(9)-11, 114(8)-11                                     =(3, -2)

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The point of contact of 9x+8y–11=0 to the hyperbola 3x2 –4y2 = 11 is