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

यदि दीर्घवृत्तों \( x^{2}+2y^{2}-6x-12y+23=0 \) और \( 4x^{2}+2y^{2}-20x-12y+35=0 \) के प्रतिच्छेदन बिंदु एक वृत्त पर स्थित हैं जिसकी त्रिज्या \( r \) और केंद्र \( (a, b) \) है, तो \( ab+18r^{2} \) का मान ___ है।

  1. A 53
  2. B 51
  3. C 52
  4. D 55
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Answer & Solution

Correct Answer

(D) 55

Step-by-step Solution

Detailed explanation

By family of curve equation of circle will be \(\Rightarrow S _1+\lambda S _2=0\) \(\Rightarrow\left(x^2+2 y^2-6 x-12 y+23\right)\) \(+\lambda\left(4 x^2+2 y^2-20 x-12 y+35\right)=0\) ⇒ for circle coeff of \(x^2=\operatorname{coeff}\). of \(y^2\)…
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