Q4 / 40 · NTA Abhyas (JEE Main) 2020 · Mathematics · Hyperbola

The locus of the midpoint of the chords of the hyperbola x225-y236=1 which passes through the point 2,4 is a hyperbola, whose transverse axis length (in units) is equal to

  • Correct answer
    A
    165
  • B
    43
  • C
    85
  • D
    6125

Solution

The equation of the chord whose mid-point is (h,k) is T=S1
⇒xh25-yk36=h225-k236
Since it passes through 2,4
2h25-4k36=h225-k236⇒h2-2h+125-k2-4k+436=125-436
Hence, the locus of h,k is
x-12169-y-226425=-1
This is the equation of a hyperbola whose transverse axis length is 165 units

Hence, the correct answer is option: 'A'.

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