What is the inverse Laplace transform ofe–as?s

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What is the inverse Laplace transform of e^–as ?
s

1. e^{– at}
2. u(t – a)
3. δ(t – a)
4. (t – a) u(t – a)

Correct Option: B

We know that

L{u(t)} =	1
	3

L{u(t – a)} =	e^{– as}
	s

Therefore, (B) is the correct choice.