Results 1 to 3 of 3

Math Help - C2 Geometric series help

  1. #1
    Newbie
    Joined
    Aug 2012
    From
    London
    Posts
    22

    C2 Geometric series help

    Stuck here on the sufficient method to approach this question, would it involve using the a(1-r^n)/1-r formula? Any assistance would be greatly appreciated. Cheers.

    'The sum of the first four terms of a geometric series is 5468.75 and the first term is 2000. Find the value of the common ratio and if all the terms are positive.'
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,790
    Thanks
    1687
    Awards
    1

    Re: C2 Geometric series help

    Quote Originally Posted by DonGorgon View Post
    Stuck here on the sufficient method to approach this question, would it involve using the a(1-r^n)/1-r formula? Any assistance would be greatly appreciated.
    'The sum of the first four terms of a geometric series is 5468.75 and the first term is 2000. Find the value of the common ratio and if all the terms are positive.'
    You have all the parts, use them.
    5468.75=\frac{2000(1-r^4)}{1-r}
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Aug 2012
    From
    London
    Posts
    22

    Re: C2 Geometric series help

    2000r^4 - 5468.75r 3468.75 = 0

    Along the right lines?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 0
    Last Post: September 5th 2012, 11:21 PM
  2. Replies: 2
    Last Post: May 22nd 2012, 05:57 AM
  3. Replies: 3
    Last Post: September 29th 2010, 06:11 AM
  4. Geometric Progression or Geometric Series
    Posted in the Math Topics Forum
    Replies: 8
    Last Post: October 8th 2009, 07:31 AM
  5. Replies: 11
    Last Post: April 1st 2008, 12:06 PM

Search Tags


/mathhelpforum @mathhelpforum