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

यदि \(\alpha\) तथा \(\beta\) समीकरण \(2 x (2 x +1)=1\) के मूल हैं, तो \(\beta\) बराबर है

  1. A \(2 \alpha^{2}\)
  2. B \(2 \alpha(\alpha+1)\)
  3. C \(-2 \alpha(\alpha+1)\)
  4. D \(2 \alpha(\alpha-1)\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(-2 \alpha(\alpha+1)\)

Step-by-step Solution

Detailed explanation

\(\alpha\) and \(\beta\) are the roots of the equation \(4 x^{2}+2 x-1=0\) \(4 \alpha^{2}+2 \alpha=1 \Rightarrow \frac{1}{2}=2 \alpha^{2}+\alpha\) \(\beta=\frac{-1}{2}-\alpha\) using equation ( 1\()\) \(\beta=-\left(2 \alpha^{2}+\alpha\right)-\alpha\)…
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