Find the Laplace transform of e-at u(t) and its ROC.

1.	Find the Laplace transform of e^-at u(t) and its ROC.
A.	( frac{1}{s-a} ), Re{s}>-a
B.	( frac{1}{s} ), Re{s}>a
C.	( frac{1}{s a} ), Re{s}>a
D.	( frac{1}{s+a} ), Re{s}>-a
Answer» E.

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