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

જો \(y=y(x)\) એ વિકલ સમીકરણ \(\left(x-x^{3}\right) d y=\left(y+y x^{2}-3 x^{4}\right) d x, x>2\) નો ઉકેલ હોય અને જો  \(y(3)=3\) આપેલ હોય તો  \(y(4)\) ની કિમંત મેળવો.

  1. A \(8\)
  2. B \(12\)
  3. C \(16\)
  4. D \(4\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(12\)

Step-by-step Solution

Detailed explanation

\(\left(x-x^{3}\right) d y=\left(y+y x^{2}-3 x^{4}\right)\, d x\) \(\Rightarrow x d y-y d x=\left(y x^{2}-3 x^{4}\right) d x+x^{3} \,d y\) \(\Rightarrow \frac{x d y-y d x}{x^{2}}=(y d x+x d y)-3 x^{2} \,d x\) \(\Rightarrow d\left(\frac{y}{x}\right)=d(x y)-d\left(x^{3}\right)\)…
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