Differential Equations and Linear Algebra (4th Edition)

Published by Pearson
ISBN 10: 0-32196-467-5
ISBN 13: 978-0-32196-467-0

Chapter 1 - First-Order Differential Equations - 1.2 Basic Ideas and Terminology - Problems - Page 22: 40

Answer

$y=xe^x-2e^x+5x+5$

Work Step by Step

Integrate to turn $y''$ into $y'$. $$\int y''(x)dx=\int x e^xdx$$ Keep integrating until the left side of the equation becomes $y$. $$y'=xe^x-e^x+C_1$$ $$y=xe^x-2e^x+C_1x+C_2=e^x(x-2)+C_1x+C_2$$ Find the values at $x=0$. $$y(0)=e^0(0-2)+C_10+C_2 \rightarrow C_2=5$$ $$y'(0)=0e^0-e^0+C_1 \rightarrow C_1=5$$ Substituting these values yields $$y=xe^x-2e^x+5x+5$$
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