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JEE Mains · Maths · STD 12 - 9. differential equations

माना अवकल समीकरण \(\log _{e}\left(\frac{d y}{d x}\right)=3 x+4 y\), \(y (0)=0\) का हल \(y = y ( x )\) है। यदि \(y \left(-\frac{2}{3} \log _{ e } 2\right)=\alpha \log _{ e } 2\) है, तो \(\alpha\) का मान बराबर है

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

Answer & Solution

Correct Answer

(B) \(-\frac{1}{4}\)

Step-by-step Solution

Detailed explanation

\(\frac{d y}{d x}=e^{3 x} \cdot e^{4 y} \Rightarrow \int e^{-4 y} d y=\int e^{3 x} d x\) \(\frac{e^{-4 y}}{-4}=\frac{e^{3 x}}{3}+C \Rightarrow-\frac{1}{4}-\frac{1}{3}=C \Rightarrow C=-\frac{7}{12}\)…
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