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Old 2009-10-29, 04:40   #2
Primeinator's Avatar
Feb 2005
Somewhere near M52..

16238 Posts

First question: It does not matter as long as your initial conditions are the same i.e. y(-2) and y'(-2) are fine.

Second question: I have never seen that method used. Your alpha and beta parts I believe are exponents in a binomial in either your particular or complimentary portion of the answer. Method of undetermined coefficients is one of my preferred methods of solution for a second order nonhomogeneous equation though variation of parameters can work as well.
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