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

अतिपरवलय \(4 x ^{2}-5 y ^{2}=20\) की एक स्पर्श रेखा जो रेखा \(x - y =2\) के समांतर है, का समीकरण है

  1. A \(x -y + 1 = 0\)
  2. B \(x -y + 7 = 0\)
  3. C \(x -y + 9 = 0\)
  4. D \(x -y -3 = 0\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(x -y + 1 = 0\)

Step-by-step Solution

Detailed explanation

Hyperbola is \(\frac{{{x^2}}}{5} - \frac{{{y^2}}}{4} = 1\) Equation of its tangent in slop from is \(y = mx \pm \sqrt {5{m^2} - 4} \) Hence tangent with slope \(1\) is \(y = x \pm 1\)
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