Calculate Inverse Laplace transform Can anybody help me with the answer of this question?

Find the inverse Laplace transform of  $$\frac {1}{(s-3)^4}$$


Take advantage of formal properties of the Laplace transform:


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*If $\mathcal{L}_s(f(x)) = g(s)$, then $\mathcal{L}_s(\mathrm{e}^{a x} f(x)) = g(s-a)$


Also use the table entry:


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*$\mathcal{L}_s(x^n) = (n-1)! s^{-n}$ 

