# help about Laplace transformation

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• March 15th 2010, 01:06 AM
ladygirl
help about Laplace transformation
hi,

can anyone tell me what is the answer for this equation

f(t) = (e^-3t) (4t)

thanks (Worried)
• March 15th 2010, 02:09 AM
mr fantastic
Quote:

Originally Posted by ladygirl
hi,

can anyone tell me what is the answer for this equation

f(t) = (e^-3t) (4t)

thanks (Worried)

You're expected to be familiar with the Shifting Theorem: $LT\left[ e^{-\alpha t} f(t)\right] = F(s - \alpha)$ where $F(s) = LT[f(t)]$.