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Second shift theorem help

  1. Feb 7, 2014 #1
    questions asks to write the piecewise function as a unit step function and then to find the laplace transform

    t(e^t) 0≤t≤5
    0 t≥3

    I know it should be along the lines of

    t(e^t) - t(e^t)u(t-5)

    which then goes to

    t(e^t) - (t-5)(e^(t-5))u(t-5)

    I know there should be more to the above equation but I just cant figure out what to do from here
  2. jcsd
  3. Feb 7, 2014 #2

    Ray Vickson

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    Science Advisor
    Homework Helper

    Your second equation is wrong: you do not get simply (t-5)(e^(t-5))u(t-5). Work everything out carefully, step-by-step.
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