Calculus 8th Edition

Published by Cengage
ISBN 10: 1285740629
ISBN 13: 978-1-28574-062-1

Chapter 9 - Differential Equations - 9.3 Separable Equations - 9.3 Exercises - Page 645: 22

Answer

$ y=-x\ln(-\ln(x)-C)$ where $C \in \mathbb R$.

Work Step by Step

$$x(vx)'=vx+xe^{v}$$ $$x(v'x+v)=vx+xe^{v}$$ $$xv'x+vx=vx+xe^{v}$$ $$xv'x=xe^{v}$$ $$xv'=e^{v}$$ $$x\frac{dv}{dx}=e^{v}$$ $$\frac{dv}{e^{v}}=\frac{1}{x}dx$$ $$ \int \frac{dv}{e^{v}}=\int \frac{1}{x}dx$$ $$ -e^{-v}=\ln(x)+C$$ $$ e^{-v}=-\ln(x)-C$$ $$ v=-\ln(-\ln(x)-C)$$ $$ \frac{y}{x}=-\ln(-\ln(x)-C)$$ $$ y=-x\ln(-\ln(x)-C)$$
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