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Q.

The equation of tangent to 4x2-9y2=36 which are  perpendicular to straight line 5x+2y-10=0 are

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a

5(y-3)=2x-1172

b

2y-5x+10-218=0

c

2y-5x-10-218=0

d

None of these

answer is D.

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Detailed Solution

The given hyperbola is x29−y24=1Equation of any line perpendicular to the line 5x+2y−10=0 can be tanken as2x−5y+k=0The above equation can be written in slope intercpet form as y=25x+k5The condition that the line y=mx+c  is to be tangent to the hyperbola is c2=a2m2−b2Hence, k52=9252−4k2=36−20=16k=±4Equation of the required tangent is y=25x±45
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