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

यदि किसी \(a \in R\), के लिए दीर्घवृत्त \(\frac{ x ^{2}}{ a ^{2}}+\frac{ y ^{2}}{9}=1\) की एक स्पर्श रेखा \(3 x +4 y =12 \sqrt{2}\) है, तो दीर्घवृत्त की नाभियों के बीच की दूरी है 

  1. A \(4\)
  2. B \(2\sqrt 7\)
  3. C \(2\sqrt 5\)
  4. D \(2\sqrt 2\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(2\sqrt 7\)

Step-by-step Solution

Detailed explanation

\(3 \mathrm{x}+4 \mathrm{y}=12 \sqrt{12}\) is tangent to \(\frac{\mathrm{x}^{2}}{\mathrm{a}^{2}}+\frac{\mathrm{y}^{2}}{9}=1\) \(c^{2}=m^{2} a^{2}+b^{2}\) \(\Rightarrow a^{2}=16\) \(\mathrm{e}=\sqrt{1-\frac{9}{16}}=\frac{\sqrt{7}}{4}\) Distance between focii…
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