Calculus: Early Transcendentals 8th Edition

Published by Cengage Learning
ISBN 10: 1285741552
ISBN 13: 978-1-28574-155-0

Chapter 9 - Section 9.3 - Separable Equations - 9.3 Exercises - Page 606: 33

Answer

$$y(x) = e^{2-\frac{x^2}{2}}+1$$

Work Step by Step

The given integral equation is $y(x) = 2 + \int_{2}^{x} (t - ty(t)) dt$. By the fundamental theorem of calculus, we have $\frac{dy}{dx} = x - xy$. This is a separable differential equation, which can be written as $\frac{dy}{dx} = \frac{x}{1/(1-y)}$. Separating the variables and integrating both sides, we get: $$\int \frac{1}{1-y} dy = \int x dx$$ $$-\ln(y-1) = \frac{x^2}{2} + C$$ where $C$ is a constant of integration. Solving for $y$, we get: $$1/(y-1) = e^{\frac{x^2}{2} + C}$$ $$y = e^{C - \frac{x^2}{2}}+1$$ We can use the initial condition $y(2) = 2$ to find the value of the constant $C$. Substituting $x = 2$ and $y(2) = 2$ into the above equation, we get: $$y(2) = e^{C - 2}+1 = 2$$ Solving for $C$, we get: $$C = 2$$ Therefore, the solution to the given integral equation is: $$y(x) = e^{2-\frac{x^2}{2}}+1$$
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