1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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: Sum of Geometric Series

  1. Nov 29, 2008 #1
    1. Sum the Geometric Series 1-x+x2-x3+x4

    and hence simplify the function

    [f(x)]4 = 1 - x5

    2. Relevant equations

    3. Not sure I quite get understand this properly, as my attempt doesnt seem quite right.

    Basically Ive gotten


    x x

    which then subtracted becomes

    s(1 - 1) = (1-1)+2x+x+x
    x x

    = 1 +4x

    Then, putting that into the simplifying function part gives me

    f(x) =

    1 -x5
    -1 +4x
    Last edited: Nov 29, 2008
  2. jcsd
  3. Nov 29, 2008 #2
    Notice that

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook