Thomas' Calculus 13th Edition

Published by Pearson
ISBN 10: 0-32187-896-5
ISBN 13: 978-0-32187-896-0

Chapter 9: First-Order Differential Equations - Section 9.2 - First-Order Linear Equations - Exercises 9.2 - Page 536: 5

Answer

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

Work Step by Step

Re-write the given differential equation as: $x \dfrac{dy}{dx}+2y=1-\dfrac{1}{x}$ This implies that $\dfrac{dy}{dx}+\dfrac{2y}{x}=\dfrac{1}{x}-\dfrac{1}{x^2}$ The integrating factor is: $v(x)=e^{\int (2/x) dx}=x^2$ Now, we have $ x^2 \dfrac{dy}{dx}+2xy=x-1$ or, $\int (x^2y)' dx=\int (x-1) dx$ and $x^2y=\dfrac{x^2}{2}-x+c$ Hence, the General solution is: $y=\dfrac{1}{2}-\dfrac{1}{x}+\dfrac{c}{x^2}$
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