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

જો \(\lambda \) એ દ્રીઘાત સમીકરણ \(3m^2x^2 + m(m -4)x + 2 = 0\) માં \(x\) ના ઉકેલોનો ગુણોત્તર હોય તો \(m\) ની કઈ કિમત માટે \(\lambda  + \frac{1}{\lambda } = 1\) થાય ?

  1. A \(2 - \sqrt 3 \)
  2. B \(4 - 3\sqrt 2 \)
  3. C \(-2 + \sqrt 2 \)
  4. D \(4 - 2\sqrt 3 \)
Verified Solution

Answer & Solution

Correct Answer

(B) \(4 - 3\sqrt 2 \)

Step-by-step Solution

Detailed explanation

Let roots are \(\alpha\) and \(\beta\) now \(\lambda+\frac{1}{\lambda}=1 \Rightarrow \frac{\alpha}{\beta}+\frac{\beta}{\alpha}=1\) \(\Rightarrow \alpha^{2}+\beta^{2}=\alpha \beta\) \((\alpha+\beta)^{2}=2 \alpha \beta\)…
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