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Proof of an inverse Laplace Transform needed please

  • Thread starter raytrace
  • Start date
  • #1
9
0

Homework Statement



[tex]\frac{s}{(s-a)(s-b)}[/tex]

Homework Equations



Now I know that it results in:

[tex]\frac{ae^(at)-be^(bt)}{a-b}[\tex]

The Attempt at a Solution



OK, I don't have the slightest clue where to begin. Could someone point me in the right direction? I've looked at all the Transforms on the table on the back of the book but none of them give me a clue as to how to deal with a [tex]\frac{s}{s-a}[\tex] situation.
 

Answers and Replies

  • #2
1,838
7
Evaluate the residues of

s/[(s-a)(s-b)] exp(st)

at s = a and s = b using L'Hôpital's theorem.
 
  • #3
9
0
Evaluate the residues of

s/[(s-a)(s-b)] exp(st)

at s = a and s = b using L'Hôpital's theorem.
Thanks for the quick reply, will try that out.
 

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