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Homework Help: Inverse Fourier Transform

  1. Dec 11, 2016 #1
    1. The problem statement, all variables and given/known data
    Solve ut+3ux=0, where -infinity < x < infinity, t>0, and u(x,0)=f(x).

    2. Relevant equations
    Fourier Transform where (U=fourier transform of u)
    Convolution Theorem

    3. The attempt at a solution
    I've used Fourier transform to get that Ut-3iwU=0 and that U=F(w)e3iwt. However, I'm completely stuck trying to find the inverse Fourier transform of e3iwt in order to use the convolution theorem; I suspect that it's a dirac delta function of t-3t, but the table that I'm using doesn't have this general form and contains a 1/2pi constant at the front for the function to be transformed.

  2. jcsd
  3. Dec 11, 2016 #2


    User Avatar
    Science Advisor
    Homework Helper

    Yes, look at this. But the argument of the delta function will be 3t+x.
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