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

यदि समीकरण \(\sqrt{2 x+1}-\sqrt{2 x-1}=1,\left(x \geqslant \frac{1}{2}\right)\), का \(x\) एक हल है, तो \(\sqrt{4 x^{2}-1}\) बराबर है

  1. A \(\frac{3}{4}\)
  2. B \(\frac{1}{2}\)
  3. C \(2\sqrt 2 \)
  4. D \(2\)
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Answer & Solution

Correct Answer

(A) \(\frac{3}{4}\)

Step-by-step Solution

Detailed explanation

\(\sqrt{2 x+1}-\sqrt{2 x-1}=1..........(1)\) \(\Rightarrow \quad 2 x+1+2 x-1-2 \sqrt{4 x^{2}-1}=1\) \(\Rightarrow 4 x-1=2 \sqrt{4 x^{2}-1}\) \(\Rightarrow 16 x^{2}-8 x+1=16 x^{2}-4\) \(\Rightarrow 8 x=5\) \(\Rightarrow \quad x=\frac{5}{8}\) which satisfies equation \((1)\) So,…
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