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JEE Mains · Maths · STD 11 - 10.2 parabola,ellipse,hyperbola

यदि रेखा, \(x -2 y =12\) दीर्घवृत्त, \(\frac{ x ^{2}}{ a ^{2}}+\frac{ y ^{2}}{ b ^{2}}=1\) को बिन्दु \(\left(3, \frac{-9}{2}\right)\) पर स्पर्श करती है, तो इसके नाभिलम्ब की लम्बाई है 

  1. A \(12\sqrt 2\)
  2. B \(9\)
  3. C \(8\sqrt 3\)
  4. D \(5\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(9\)

Step-by-step Solution

Detailed explanation

Tangent at \(\left( {3,\frac{{ - 9}}{2}} \right)\) \(\frac{{3x}}{{{a^2}}} - \frac{{9y}}{{2{b^2}}} = 1\) Comparing with \(x - 2y = 12\) \(\frac{3}{{{a^2}}} - \frac{9}{{4{b^2}}} = \frac{1}{{12}}\) \( \Rightarrow a = 6\) and \(b = 3\sqrt 3 \) Length of latus rectum…
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