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 - Practice Exercises - Page 557: 21

Answer

$y=x^2e^{-x}(3x-3)$

Work Step by Step

Here, we have $y'+(\dfrac{x-2}{x}) y=3x^2e^{-x}$ The integrating factor is: $I=e^{\int (\dfrac{x-2}{x}) dx}=\dfrac{e^x}{x^2}$ Now, $(\dfrac{e^x}{x^2})[y'+(\dfrac{x-2}{x}) y]=(\dfrac{e^x}{x^2})(3x^2e^{-x})$ This implies that $\int [\dfrac{e^x}{x^2}y]' =3 \int dx $ $\implies \dfrac{e^xy}{x^2}=3x+c$ Now, apply the initial conditions. Thus, we have $c=-3$ $\dfrac{e^xy}{x^2}=3x-3 \implies y=(x^2e^{-x})(3x-3)$
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