- #1
th3chemist
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Homework Statement
I have to solve the differential equation xy'' + y' + xy = 0 ; x_o = 0
Homework Equations
The Attempt at a Solution
I know that a solution is y= sum from 0 to infinity (an (x-1)^n)
I then differentiate it twice to get y' = sum from 1 to inifinity (nan(x-1)^(n-1))
and y'' = sum from 2 to infinity (n(n+1)an(x-1)^(n-2))
then sub into the equation.
Once It's in the equation I multiply y'' and y by (x-1) and add the correcting factor. Which would give me adding 5 series in total.
Now, I just don't know how to add these series together. The n has to be same. And the exponent on (x-1) has to be the same as well.
I'm not sure how to write this out so it looks nicer.