Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Really Quick Differential Equation question

  1. Apr 19, 2008 #1
    !!Really Quick Differential Equation question...

    1. The problem statement, all variables and given/known data
    Alright so this is what I have for this problem. As you can see I used -i to find my Eigenvectors.....now when I find my solution and plug it back into the original, I am getting the opposite of what I am supposed to get.

    Was I supposed to use -t instead of +t in my solution since I used lambda=-i to find it?
    Or did I make some stupid algebraic error again?


  2. jcsd
  3. Apr 19, 2008 #2
    I am thinking I should have used cos(-t) and sin(-t) since I used [itex]-i\Rightarrow \alpha=0\ \beta=-1[/itex]
  4. Apr 19, 2008 #3
    I replaced t with -t and this worked. So I will assume my reason was correct.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook