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

माना अवकल समीकरण \(x \frac{ dy }{ dx }- y =\sqrt{ y ^2+16 x ^2}, \quad y (1)=3\) का हल वक्र \(y = y ( x )\) है। तब \(y (2)\) बराबर है :

  1. A \(15\)
  2. B \(11\)
  3. C \(13\)
  4. D \(17\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(15\)

Step-by-step Solution

Detailed explanation

\(y=v x \Rightarrow \frac{d y}{d x}=v+x \frac{d v}{d x}\) \(\Rightarrow x \frac{d v}{d x}=\sqrt{v^{2}+16}\) \(\Rightarrow \int \frac{d v}{\sqrt{v^{2}+16}}=\int \frac{d x}{x}\) \(\Rightarrow \ln \left|v+\sqrt{v^{2}+16}\right|=\ln x+\ln C\)…
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