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

माना वक्रों \(4 x ^{2}+9 y ^{2}=36\) तथा \((2 x )^{2}+(2 y )^{2}=31\) की एक ऊभयनिष्ठ स्पर्श रेखा \(L\) है। तो रेखा \(L\) की प्रवणता का वर्ग बराबर है

  1. A \(3\)
  2. B \(6\)
  3. C \(5\)
  4. D \(4\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(3\)

Step-by-step Solution

Detailed explanation

Given curves are \(\frac{ x ^{2}}{9}+\frac{ y ^{2}}{4}=1\) \(x^{2}+y^{2}=\frac{31}{4}\) let slope of common tangent be \(m\) so tangents are \(y=m x \pm \sqrt{9 m^{2}+4}\) \(y=m x \pm \frac{\sqrt{31}}{2} \sqrt{1+m^{2}}\) hence \(9 m ^{2}+4=\frac{31}{4}\left(1+ m ^{2}\right)\)…
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