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Integral of cumulative age distribution curve

  1. Jul 14, 2010 #1
    How do you integrate 2exp(1-x).dx?

    The expression describes the cumulative number of cells as a function of cell age (0 newborn, 1 at division) in an exponentially growing culture.

    Thanks for any help.

    Dave
     
  2. jcsd
  3. Jul 14, 2010 #2

    HallsofIvy

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    Science Advisor

    Let u= 1- x so that du= - dx.
    [tex]\int 2 e^{1-x} dx= -2\int e^u du[/tex]
     
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