Finding the Laplace Transform of a Function with Heaviside Terms

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Homework Statement



the function is with the attachment

The question is

(i) Express f(t) in terms of the Heaviside function and hence or otherwise find L(f(t)), the Laplace transform of f(t).

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The Attempt at a Solution



Everything is in the attachment. Please have a look and I would really appreciate it if you could give me the whole solution. I got an answer but not sure if it is right.
 

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could you show us what you have done please?
 
You got to wait for the attachment to be approved. it takes a while...its a bit too long to write on the template plus i don't have the math symbols so it mite get a bit confusing
 
any hints or solution?
 
You restatement of f(t) in terms of the Heaviside function u(t-a) is incorrect. In particular there is supposed to be a u(t) term which does not appear anywhere in your solution.
 
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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