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JEE Mains · Maths · STD 12 - 7.1 indefinite integral

माना \(\mathrm{I}(\mathrm{x})=\int \sqrt{\frac{\mathrm{x+7}}{\mathrm{x}}} d \mathrm{x}\) तथा \(\mathrm{I}(9)=12+7 \log _{\mathrm{e}} 7\) है। यदि \(\mathrm{I}(1)=\alpha+7 \log _{\mathrm{e}}(1+2 \sqrt{2})\) है, तो \(\alpha^4\) बराबर है_____________.

  1. A \(63\)
  2. B \(62\)
  3. C \(61\)
  4. D \(64\)
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Answer & Solution

Correct Answer

(D) \(64\)

Step-by-step Solution

Detailed explanation

\(\int \sqrt{\frac{x+7}{x}} d x\) Put \(x = t ^2\) \(d x=2 tdt\) \(\int 2 \sqrt{ t ^2+7} d t=2 \int \sqrt{ t ^2+\sqrt{7}^2} d t\) \(I ( t )=2\left[\frac{ t }{2} \sqrt{ t ^2+7}+\frac{7}{2} \ln \left| t +\sqrt{ t ^2+7}\right|\right]+ C\)…
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