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: 45


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Work Step by Step

Take the derivatives of the function. $$y(x)=c_1e^{2x}+c_2e^{-3x}$$ $$y'(x)=2c_1e^{2x}-3c_2e^{-3x}$$ $$y''(x)=4c_1e^{2x}+9c^2e^{-3x}$$ Substituting these functions into the differential equation yields $$y''+y'-6y=0$$ $$4c_1e^{2x}+9c^2e^{-3x}+2c_1e^{2x}-3c_2e^{-3x}-6(c_1e^{2x}+c_2e^{-3x})=0$$ $$0=0$$ This statement is true, therefore, the equation must be a valid solution to the differential equation.
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