Answer
$\dfrac{3}{(s+1)^2}$
Work Step by Step
The Laplace transform of function $3t$ is given as:
$L(3t)=\dfrac{3}{s^2}$
The first shifting Theorem for $a=-1$ can be expressed as:
$L[ 3t e^{-t}]=\dfrac{3}{(s+1)^2}$
Differential Equations and Linear Algebra (4th Edition)
by Goode, Stephen W.; Annin, Scott A.
Published by
Pearson
ISBN 10:
0-32196-467-5
ISBN 13:
978-0-32196-467-0
Chapter 10 - The Laplace Transform and Some Elementary Applications - 10.5 The First Shifting Theorem - Problems - Page 694: 21
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