Finding Laplace Transform of F(s): A Struggling Student's Story

drew1435
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Homework Statement


find laplace transform of F(s)= (1/t)*(exp(2t)-1)


Homework Equations



stated answer: ln(s/(s-2))

The Attempt at a Solution


i really don't know where to start with laplace. my teacher has done a terrible job really jusut explaining the simplr process. Should i distrivute the 1/t first?? But the laplace of 1/t does not exist correct? so do i just integrate exp(-st)(exp(2t)/t)
 
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Right, the laplace transform of 1/t doesn't exist. But neither does the transform of exp(2t)/t. Look at the power series expansion of (exp(2t)-1)/t. The transform of that might exist.
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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