Q. An integrating factor of the differential equation $x\ \frac{dy}{dx} + y\log x = xe^{x}x^{- \frac{1}{2}\log x},\ (x > 0)$, is

A) $x^{\log x}$
B) $\left( \sqrt{x} \right)^{\log x}$
C) $\left( \sqrt{e} \right)^{\left( \log x \right)^{2}}$
D) $e^{x^{2}}$
Explanation

(c)
Given, $\frac{dy}{dx} + y.\frac{1}{x}\log x = e^{x}\ x^{- \left( \frac{1}{2} \right)\log x}$
$\therefore$ $IF = e^{\int_{}^{}{\frac{1}{x}\log x\ dx}} = e^{\int_{}^{}\frac{\left( \log x \right)^{2}}{2}} = \left( \sqrt{e} \right)^{\left( \log x \right)^{2}}$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.