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Antidifferentiate e^r/2

  1. Aug 19, 2008 #1
    how do i antidifferentiate that

    I'm working on integration by parts problems and that little part of the problem has been bothering me, i figured that the indefinte integral would be the same but then my answer came out different

    here's the whole proble, i know how to do these problems it's just that i forgot a lot of stuff about calculus and i just need to touch up on some things,

    here's the problem if you want to get a clearer picture of it
    ∫re^r/2 dr
    u=r dv =e^ r/2
    du= dr v=? i just need to find v that's all

    here's the formula for integration by parts just in case you forgot it
    ∫u dv= uv - ∫v du
     
  2. jcsd
  3. Aug 19, 2008 #2

    nicksauce

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    Re: e^r/2

    So you need to evaluate [tex]\int e^{\frac{r}{2}}dr[/tex] correct?. You're aware that [tex]\int e^xdx = e^x[/tex] (plus a constant) correct? The connection between the two should be obvious... if not, make a substiution such as x=r/2.
     
  4. Aug 19, 2008 #3
    Re: e^r/2

    ok, i'm aware of it, so when i make the substitution for x=r/2 what's next
     
  5. Aug 19, 2008 #4

    nicksauce

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    Re: e^r/2

    What's next is figuring out how dx relates to dr.
     
  6. Aug 19, 2008 #5
    Re: e^r/2

    ok i get it
     
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