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JEE Mains · Maths · STD 11 - 10.1 circle and system of circle

यदि वक्र \(x^{2}=y-6\) के बिंदु \((1,7)\) पर बनी स्पशरिखा वृत्त \(x^{2}+y^{2}+16 x+12 y+c=0\) को स्पर्शे करती है, तो \(c\) का मान है

  1. A \(185\)
  2. B \(85\)
  3. C \(95\)
  4. D \(195\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(95\)

Step-by-step Solution

Detailed explanation

Equation of tangert at \((1,7)\) to \({x^2} = y - 6\) is \(2x - y + 5 = 0\) Now, perpentdicular from center \(O(-8,-6)\)to \(2x - y + 5 = 0\) should be equal to radium of the circle \(\left| {\frac{{ - 16 + 6 + 5}}{{\sqrt 5 }}} \right| = \sqrt {64 + 36 - C} \)…
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