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

ધારોકે \(f\) એ એવું વિકલનીય વિધેય છે કે જેથી \(x^2 f(x)-x=4 \int \limits_0^x t f(t) d t\), \(f(1)=\frac{2}{3}\) તો \(18 f(3)=.......\)

  1. A \(160\)
  2. B \(210\)
  3. C \(180\)
  4. D \(150\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(160\)

Step-by-step Solution

Detailed explanation

Differentiate the given equation \(\Rightarrow 2 x f(x)+x^2 f^{\prime}(x)-1=4 x f(x)\) \(\Rightarrow x^2 \frac{d y}{d x}-2 x y=1\) \(\Rightarrow \frac{d y}{d x}+\left(-\frac{2}{x}\right) y=\frac{1}{x^2}\) \(I F .=e^{\int-\frac{2}{x} t n x}=\frac{1}{x^2}\)…
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