University Calculus: Early Transcendentals (3rd Edition)

Published by Pearson
ISBN 10: 0321999584
ISBN 13: 978-0-32199-958-0

Chapter 16 - Practice Exercises - Page 16-34: 18

Answer

$y=\dfrac{x^4+2x^2+1}{4x^2}$

Work Step by Step

The standard form of the given equation is: $y'+\dfrac{2}{x} y=x+\dfrac{1}{x}$ ....(1) The integrating factor is: $e^{\int (\dfrac{2}{x}) dx}=x^2$ In order to determine the general solution, multiply equation (1) with the integrating factor and integrate both sides. $\int [x^2y]' =\int x^3+x dx $ or, $y=x^{-2}(\dfrac{x^{4}}{4}+\dfrac{x^2}{2}+c)$ Applying the initial conditions, we get $c=\dfrac{1}{4}$ Thus, we have $y=\dfrac{x^{2}}{4}+\dfrac{1}{4x^2}+\dfrac{1}{2}$ Hence, $y=\dfrac{x^4+2x^2+1}{4x^2}$
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