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Second order linear nonhomogeneous equations

Name: Anonymous 2009-08-04 14:01

How do I find the general solution for the following equation?

y''-2/x^2 y= 3-x^-2; y1=x^2, y2=x^-1

Name: Anonymous 2009-08-04 15:21

i dunno lol

Name: Anonymous 2009-08-04 15:30

Name: Anonymous 2009-08-04 20:18

substitute y = x^2u
y' = 2xu + x^2 u'
y'' = 2u + 4x u' + x^2 u''

y''-2/x^2 y=  2u + 4x u' + x^2 u'' - 2u = 3- x^-2

4xu' + x^2u'' = 3 - x^-2

let u' = v

4xv + x^2v' = 3 - x^-2
4x^3v + x^4v' = 3x^2 - 1
x^4 * v = x^3 - x + A
v = u' = x^-1 - x^-3 + Ax^-4
u = log x + 1/2 x^-2 + A'x^-3 + B
y = x^2 u = x^2 log x + 1/2 + A/x + Bx^2

Name: Anonymous 2009-08-04 22:37

>>4
My way was faster.

Name: Anonymous 2009-08-05 0:16

Can anyone do it with variation parameters

Name: Anonymous 2009-08-05 1:11


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