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JEE Mains · Maths · STD 11 - 4.2 Quadratic equations and inequations

यदि \(\lambda \in R\) ऐसा है कि समीकरण \(x^{2}+(2-\lambda) x+(10-\lambda)=0\) के मूलों के घनों का योग न्यूनतम है, तो इस समीकरण के मूलों के अंतर का परिमाण है

  1. A \(20\)
  2. B \(2\sqrt 5 \)
  3. C \(2\sqrt 7 \)
  4. D \(4\sqrt 2 \)
Verified Solution

Answer & Solution

Correct Answer

(B) \(2\sqrt 5 \)

Step-by-step Solution

Detailed explanation

Let, the roots of the equation, \(x^{2}+(2-\lambda) x+(10-\lambda)=0\) are \(\alpha\) and \(\beta\). Also roots of the given equation are \(\frac{\lambda-2 \pm \sqrt{4-4 \lambda+\lambda^{2}-40+4 \lambda}}{2}=\frac{\lambda-2 \pm \sqrt{\lambda^{2}-36}}{2}\) The magnitude of the…
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