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 - 1.12 Chapter Review - Additional Problems - Page 110: 34

Answer

\[y(x)=C(1+x)e^x\]

Work Step by Step

$(1+x)y'=y(2+x)$ ____(1) (1) is Separable differentiable equation \[y'=\frac{dy}{dx}=\frac{y(2+x)}{1+x}\] Separating variable, \[\frac{dy}{y}=\left(\frac{2+x}{1+x}\right)dx\] Integrating, \[\int\frac{dy}{y}=\int\left(\frac{2+x}{1+x}\right)dx+C_{1}\] $C_{1}$ is constant of integration \[\ln|y|=\int\left[1+\frac{1}{1+x}\right]dx+C_{1}\] \[\ln|y|=x+\ln|1+x|+C_{1}\] \[y=e^{x+\ln |1+x|+C_{1}}\] \[y(x)=C(1+x)e^x\] Where $C=e^{C_1}$ Hence general solution of (1) is $y(x)=C(1+x)e^x$
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