Calculus 8th Edition

Published by Cengage
ISBN 10: 1285740629
ISBN 13: 978-1-28574-062-1

Chapter 9 - Differential Equations - 9.5 Linear Equations - 9.5 Exercises - Page 665: 9

Answer

$y= \frac{2}{3}\sqrt x+\frac{C}{x}$

Work Step by Step

Given $$x y^{\prime}+y=\sqrt{x}$$ Rewrite the equation $$ y'+ \frac{1}{x} y= \frac{1}{\sqrt{x}} $$ Since the equation is linear and $p(x)= \dfrac{1}{x} $ and $q(x)= \dfrac{1}{\sqrt{x}} $, then \begin{align*} \mu &=e^{\int p(x)}dx\\ &= e^{\int (1/x)dx}\\ &=e^{\ln x}\\ &= x \end{align*} Hence the general solution given by \begin{align*} \mu(x)y&=\int \mu(x)q(x)dx\\ x y&= \int x \dfrac{1}{\sqrt{x}}dx\ \ \ \\ &= \int \sqrt{x} dx\\ &= \frac{2}{3}x^{3/2}+C \end{align*} Then $$ y= \frac{2}{3}\sqrt x+\frac{C}{x}$$
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