Laplace transform with time shift

  • Thread starter maxsthekat
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  • #1
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Homework Statement



I need to find the Laplace transform of t*e-t*u(t-tau)

2. Homework Equations and attempt at solution

I know the general form of the transform, but my problem is in the time shift of the step function. If both parts of the expression were (t-tau), then I could just pull out an e(s*tau), but I have no idea what I'm supposed to do when one part has it and the other does not.

Can anyone help get me started?
 

Answers and Replies

  • #2
vela
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Hint:

[tex]te^{-t} = (t-\tau+\tau)e^{-(t-\tau+\tau)}[/tex]
 

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