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Derivative of power series

  1. Apr 1, 2015 #1
    • Member warned about posting with no effort
    1. The problem statement, all variables and given/known data
    substitute the given power series below into ODE y'' -4y=0 to verify it is a solution
    2. Relevant equations
    y=∑ 2n xn / n!
    n=0

    y''-4y=0
    3. The attempt at a solution

    I have absolutely no idea how start.
     
  2. jcsd
  3. Apr 1, 2015 #2
    you must know the derivative of ##x^n## by now. that's somewhere you could start.
     
  4. Apr 1, 2015 #3

    Mark44

    Staff: Mentor

    Locked because no attempt was shown.
     
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