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

माना दो बिन्दुओं \(P\) तथा \(Q\) के भुज समीकरण \(2 x ^2- rx + p =0\) के मूल है तथा \(P\) तथा \(Q\) बिन्दुओं की कोटि \(x ^2- sx - q =0\) के मूल है। यदि \(PQ\) को व्यास लेकर बने वृत्त का समीकरण \(2\left( x ^2+ y ^2\right)-11 x -14 y -22=0\) है तो \(2 r + s -\) \(2 q + p\) होगा ।

  1. A \(5\)
  2. B \(9\)
  3. C \(6\)
  4. D \(7\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(7\)

Step-by-step Solution

Detailed explanation

Equation of the circle with \(PQ\) as diameter is \(2\left(x^{2}+y^{2}\right)-r x-2 s y+p-2 q=0\) on comparing with the given equation \(r\) = \(11\), \(s\) = \(7\) \(p-2 q=-22\) \(\therefore 2 r+s-2 q+p=22+7-22=7\)
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