Elementary Differential Equations and Boundary Value Problems 9th Edition

Published by Wiley
ISBN 10: 0-47038-334-8
ISBN 13: 978-0-47038-334-6

Chapter 2 - First Order Differential Equations - 2.9 First Order Difference Equations - Problems - Page 132: 1

Answer

$y=\frac{1}{5}x^3+Cx^{-2}$

Work Step by Step

This equation can be rewritten as $$\frac{dy}{dx} = x^2-\frac{2y}{x}=x^2-\frac{2}{x}y$$ Therefore, $$\frac{dy}{dx}+\frac{2}{x}y=x^2$$ Multiplying both sides of the equation by $x^2$ gives $$x^2\frac{dy}{dx}+2xy=x^4$$ By product rule, $(x^2y)'=2xy+x^2y'$, so $$\frac{d}{dx}(x^2y)=x^4$$ Integrating both sides with respect to $x$ gives $$x^2y=\frac{1}{5}x^5+C$$ Finally, dividing both sides by $x^2$ gives $$y=\frac{1}{5}x^3+Cx^{-2}$$
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