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:
$L[ 3t e^{-t}]=\dfrac{3}{(s+1)^2}$
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