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HELP! Inverse Laplace Transform

  1. Apr 9, 2009 #1
    I'm having some trouble getting the inverse Laplace to the following problems...I need some help

    F(s)=24/s^5

    F(s)= 4/[((s-2)^2)+25

    F(s)= s/(s-1)(s+1)
     
  2. jcsd
  3. Apr 10, 2009 #2

    rock.freak667

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    Homework Helper

    For the first one, consider L{tn} works out to be for n>0.

    For the second one what is

    [tex]L^{-1} (\frac{1}{s^2+k^2)[/tex]

    for the third one, split into partial fractions.
     
  4. Apr 10, 2009 #3

    would this be right for the third one

    A/s-1 + B/s+1 = s
     
  5. Apr 10, 2009 #4

    djeitnstine

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    Gold Member

    Yes that's correct.
     
  6. Apr 10, 2009 #5
    No that is wrong, the right formula is:

    [tex]\frac{s}{(s-1)(s+1)}=\frac{A}{s-1}+\frac{B}{s+1}[/tex]

    from which you need to determine A and B.

    coomast
     
  7. Apr 10, 2009 #6

    djeitnstine

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    Gold Member


    Oops I thought he multiplied it out and set it equal to s:rolleyes:
     
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