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Homework Help: Variation of Parameters herupu

  1. Apr 30, 2012 #1
    1. The problem statement, all variables and given/known data
    y'' + y' = 4t


    2. Relevant equations

    Use Variation of parameters!
    Inline31.gif

    3. The attempt at a solution

    So I get homo of: c1 + c2 e^-(t)

    From there I get a Wronskian of
    -e^(-t)

    Then I get variations 2t^2 and -4e^t(t-1)

    Then get the answer of 2t^2 + 4t - 4

    Btu its wrong :< uguu
     
  2. jcsd
  3. Apr 30, 2012 #2

    ehild

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    Check the signs.

    ehild
     
  4. Apr 30, 2012 #3
    derp
     
  5. Apr 30, 2012 #4

    HallsofIvy

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    derp?
    herupu?
    uguu?

    What language is this?
     
  6. Apr 30, 2012 #5

    DryRun

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    LOL! :rofl: I couldn't resist clicking on the title.

    FHamster, nobody is going to take your questions/problems seriously if you use weird words to accompany your academic ventures.
     
  7. Apr 30, 2012 #6

    ehild

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    You mean my answer was stupid? Thank you.

    ehild
     
  8. Apr 30, 2012 #7
    weaboonese

    I mean I derped
     
  9. Apr 30, 2012 #8
    LOL he said homo(I am such a child)
     
  10. Apr 30, 2012 #9

    DryRun

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    How did i miss that? :rofl:
     
  11. Apr 30, 2012 #10

    ehild

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    FHamster,

    We use English here. I tried to help you, could you answer something in normal English?

    ehild
     
  12. Apr 30, 2012 #11
    It was very helpful. Thank you.
     
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