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

माना \(x^2-4 x-6=0\) के मूल एक वृत्त पर दो बिंदुओं \(P\) तथा \(Q\) के भुज हैं तथा \(y ^2+2 y -7=0\) के मूल \(P\) तथा \(Q\) की कोटि है। यदि \(PQ\), वृत्त \(x ^2+ y ^2+2 ax +2 by + c =0\) का एक व्यास है, तो \(( a + b - c )\) का मान है :

  1. A \(12\)
  2. B \(13\)
  3. C \(14\)
  4. D \(16\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(12\)

Step-by-step Solution

Detailed explanation

Equation of circle diameter form \(\left(x-x_{1}\right)\left(x-x_{2}\right)+\left(y-y_{1}\right)\left(y-y_{2}\right)=0\) (where \(x_{1}, x_{2}\) are the roots of \(x^{2}-4 x-6=0\) and \(y_{1}\), \(y _{2}\) are the roots of \(y ^{2}+2 y -7=0\) ) \(x^{2}+y^{2}-4 x+2 y-13=0\)…
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