Explanation Procedure used: Solution to a second order differential equation: Consider the case of a second order differential equation a y ″ + b y ′ + c y = 0 , where a , b and c are constants. If we try to find a solution of the form y = e m x . Then substitution of y ′ = m e m x and y ″ = m 2 e m x into the equation a y ″ + b y ′ + c y = 0 becomes a m 2 e m x + b m e m x + c e m x = 0 or e m x ( a m 2 + b m + c ) = 0. Since for a real x e m x ≠ 0 , it is apparent that the only way y = e m x satisfy the differential equation a y ″ + b y ′ + c y = 0 is when it is chosen as a root of the quadratic equation a m 2 + b m + c = 0 . Case I: Distinct real roots The general solution of a y ″ + b y ′ + c y = 0 on this interval ( − ∞ , ∞ ) is y = c 1 e m 1 x + c 2 e m 2 x . Case II: Repeated real roots The general solution is y = c 1 e m 1 x + c 2 x e m 1 x . Case III: Conjugate Complex Roots If m 1 and m 2 and are complex, then m 1 = α + i β and m 2 = α − i β , where α and β > 0 are real and i 2 = − 1 . The general solution is y = e a x ( c 1 cos β x + c 2 sin β x ) . Calculation: The given differential equation is x 3 y ‴ + x y ′ − y = 0 . It can be written as, x 3 d 3 y d x 3 + x d y d x − y = 0 . Let y = x m be a solution of the differential equation. Differentiate y = x m thrice and obtain the value of d 3 y d x 3 as follows

Differential Equations with Boundary-Value Problems

9th Edition

ISBN: 9781337632515

Author: Dennis G. Zill

Publisher: Cengage Learning US

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Chapter 4.7, Problem 16E

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To solve: The differential equation x3y‴+xy′−y=0.

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Differential Equations with Boundary-Value Problems

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The differential equation x 3 y ‴ + x y ′ − y = 0 .

Solution Summary: The author explains how to solve the differential equation x3y′′′+x

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To solve: The differential equation x3y‴+xy′−y=0.

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