Help with Laplace Transform

  • Thread starter thedc
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Homework Statement


Let f(t) denote a causal signal. Show that L+ {f(−at)} = 0 for any a > 0.

Homework Equations





The Attempt at a Solution


I know that the laplace{f(at)} = 1/a*F(s/a)

but by simply placing -a whenever determining the Laplace, my signs gets confused within the integral. So my answer is

1/-a*F(s/a) and not 0

Does anyone know how to do this so the L+ {f(−at)} = 0 ?

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
LCKurtz
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What is a "causal signal"?

What does L+ {f(−at)} mean?
 

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