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Homework Help: Inverse laplace question help

  1. Nov 23, 2006 #1
    inverse laplace question help plz....

    i am trying find the inverse laplace transfor of s+1/s^2 -4s +4

    using partial fractions and solving my answer is e^2t + 3e^2t

    however checking this in an online fourier-laplace calculator it comes up with e^2t + 3te^2t

    who is correct? could you show me how you get your answer plz....

    thanks
     
  2. jcsd
  3. Nov 23, 2006 #2

    nazzard

    User Avatar
    Gold Member

    Hello cabellos,

    I get the same result as your calculator. You might have made a mistake while using the partial fractions method.

    [tex]\frac{s+1}{s^2-4s+4}=\frac{s+1}{(s-2)^2}=\frac{1}{s-2}+\frac{3}{(s-2)^2}[/tex]

    Regards,

    nazzard
     
    Last edited: Nov 23, 2006
  4. Nov 23, 2006 #3
    hi, oops im not awake :zzz: ....i used s-2 as the denominator for both A and B. Thanks
    :rofl:
     
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