Thursday, November 20, 2008

variation of parameter method

solve xy" - 4y' = x^4 by method of variation of parameter
make the coefficient of y" unity by dividing by x

find CF in the form Ay1 + By2 (using trial and error or some other method)
find the wronskian
and then find the PI as shown below


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  1. Possible error in "u"
    The integral should be -1/25, not -1/5

  2. thank you for pointing out the error


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