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Simple looking 2nD ODE, with 2 sols, 0 and 3, confused on what to do now!

  1. Feb 16, 2006 #1
    Hello everyone, I have time again to do more math so here i am!
    I'm confused on what they want me to do here, I found A and B but they arn't pretty and i dind't even think they are right. Here is the problem, it has 2 inital conditions, both y(x) no y'(x) which also confused me.
    ind y as a function of t if
    y'' - 3y' = 0,
    y(0) = 9, y(1) = 7 .
    y(t) =

    [​IMG]

    THanks! any help would be great!
     
  2. jcsd
  3. Feb 16, 2006 #2
    There is a mistake in your line [tex]7=Be^{3t}+A[/tex]. Can you see it?


    EDIT: As so emphatically :wink: pointed out below, that is your mistake.
     
    Last edited: Feb 16, 2006
  4. Feb 16, 2006 #3

    HallsofIvy

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    A and B are CONSTANTS!! In y(1)= 7, you didn't set t= 1.
     
  5. Feb 16, 2006 #4
    Ahh thank you everyone, I friggin' got it:
    [​IMG]
     
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