Hyperbola 2 Question 6

6. If a hyperbola passes through the point P(2,3) and has foci at (±2,0), then the tangent to this hyperbola at P also passes through the point

(2017 Main)

(a) (32,23)

(b) (22,33)

(c) (3,2)

(d) (2,3)

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Answer:

Correct Answer: 6. (d)

Solution:

  1. Let the equation of hyperbola be x2a2y2b2=1.

ae=2a2e2=4a2+b2=4b2=4a2x2a2y24a2=1

Since, (2,3) lie on hyperbola.

2a234a2=182a23a2=a2(4a2)85a2=4a2a4a49a2+8=0(a48)(a41)=0a4=8,a4=1a=1

Now, equation of hyperbola is x21y23=1.

Equation of tangent at (2,3) is given by

2x3y3=12xy3=1

which passes through the point (22,33).



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