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JEE Mains · Maths · STD 11 - 8. sequence and series

यदि \(\log _{3} 2, \log _{3}\left(2^{x}-5\right), \log _{3}\left(2^{x}-\frac{7}{2}\right)\) एक समांतर श्रेढ़ी में है, तो \(x\) का मान बराबर है .............. |

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

Answer & Solution

Correct Answer

(C) \(3\)

Step-by-step Solution

Detailed explanation

\(2 \log _{3}\left(2^{x}-5\right)=\log _{3} 2+\log _{3}\left(2^{x}-\frac{7}{2}\right)\) Let \(2^{\mathrm{x}}=\mathrm{t}\) \(\log _{3}(t-5)^{2}=\log _{3} 2\left(t-\frac{7}{2}\right)\) \((t-5)^{2}=2 t-7\) \(t^{2}-12 t+32=0\) \((t-4)(t-8)=0\)…
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