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

Undetermined coefficients

  1. Nov 3, 2014 #1
    Hi there, I know that when I am to guess a solution to to a polynomial for g(t) that I guess Ax^n + Bx^n-1... when the highest power of the polynomial is n but what is my guess supposed to be if the power of n is negative?

    ex.
    y'' + 4y' + 4y = t^-2*e^(-2t)

    so far my guess is,

    A*e^(-2t)(B*?...)
     
  2. jcsd
  3. Nov 3, 2014 #2

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

  4. Nov 3, 2014 #3

    LCKurtz

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    To add to SteamKing's link, you don't even try undetermined coefficients if n is negative, because it won't work.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Undetermined coefficients
Loading...