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Fundamentals Of Differential Equations And Boundary Value Problems
Found in: Page 332
Fundamentals Of Differential Equations And Boundary Value Problems

Fundamentals Of Differential Equations And Boundary Value Problems

Book edition 9th
Author(s) R. Kent Nagle, Edward B. Saff, Arthur David Snider
Pages 616 pages
ISBN 9780321977069

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Short Answer

Find a general solution for the differential equation with x as the independent variable:

u'''9u''+27u'27u=0

The general solution for the differential equation with x as the independent variable is u(x)=c1e3x+c2xe3x+c3x2e3x

See the step by step solution

Step by Step Solution

Step 1: Auxiliary equation:

In the equation, r39r3+27r27=0 , we recognize a complete cube, namely, (r3)3=0 . Thus, it has just one root x = 3 of multiplicity three.

Step 2: General solution:

The general solution to the given differential equation is given by

u(x)=c1e3x+c2xe3x+c3x2e3x

Hence the final solution is u(x)=c1e3x+c2xe3x+c3x2e3x

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