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

ધારોકે વક્રો \(y^2=4 x\) અને \((x-4)^2+y^2=16\) ના સામાન્ય સ્પર્શકો વક્રોને બિંદુુ \(P\) અને \(Q\) માં સ્પર્શે છે.તો \((P Q)^2=..........\)

  1. A \(31\)
  2. B \(30\)
  3. C \(33\)
  4. D \(32\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(32\)

Step-by-step Solution

Detailed explanation

General tangent of slope \(m\) to the circle \((x-4)^2+\) \(y ^2=16\) is given by \(y=m(x-4) \pm 4 \sqrt{1+m^2}\) General tangent of slope \(m\) to the parabola \(y^2=4 x\) is given by \(y=m x+\frac{1}{m}\) For common tangent \(\frac{1}{m}=-4 m \pm 4 \sqrt{1+m^2}\)…
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