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

\(y ( x )\), जो अवकल समीकरण \(\frac{d y }{ dx }= xy -1+ x - y\); \(y (0)=0\) को सन्तुष्ट करता है, के लिए निम्न में कौन सा सत्य है?

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

Answer & Solution

Correct Answer

(A) \(y (1)= e ^{-\frac{1}{2}}-1\)

Step-by-step Solution

Detailed explanation

\(\frac{d y}{d x}=(1+y)(x-1)\) \(\frac{d y}{(y+1)}=(x-1) d x\) Integrate \(\ln (y+1)=\frac{x^{2}}{2}-x+c\) \((0,0) \Rightarrow c=0 \Rightarrow y=e^{\left(\frac{x^{2}}{2}-x\right)}-1\)
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