- #1
jaus tail
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Homework Statement
Find laplace of e-atu(t) where a > 0
Homework Equations
Laplace is integration from -inf to +inf f(t)e-stdt
u(t) is 1 for t more than equal to 0.
The Attempt at a Solution
Well i got the answer as X(s) = 1/(s+a).
But the book said something like ROC like region of convergence and for that s must be more than -a
I understand that s more than minus a, gives positive 1/(s+a)
but why?
Why can't ROC be negative? What does ROC mean? I am studying Signals and Processing.