Results 1 to 2 of 2

Math Help - Recursion and finding terms

  1. #1
    Ramstien
    Guest

    Recursion and finding terms

    I need to find the first 5 terms of a recursive formula. I don't have either the formula nor the terms, but I have 4 numbers: 3.5, -7, 14, -28.

    How do I get the first 5 terms of it? How would I put it in terms of an = bn + c (or an+1, and so fourth)?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by Ramstien View Post
    I need to find the first 5 terms of a recursive formula. I don't have either the formula nor the terms, but I have 4 numbers: 3.5, -7, 14, -28.

    How do I get the first 5 terms of it? How would I put it in terms of an = bn + c (or an+1, and so fourth)?
    There's probably an expected answer that relies on you noticing that each term is obtained from the one before it by multiplying by -2. Hmmmmmm geometric series, a = 3.5, r = -2 ....... hmmmmmmm .........
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Finding Explicit formula for a recursion
    Posted in the Discrete Math Forum
    Replies: 7
    Last Post: December 15th 2010, 08:44 PM
  2. Finding the first five terms of a sequence.
    Posted in the Pre-Calculus Forum
    Replies: 4
    Last Post: April 7th 2010, 02:42 PM
  3. Progressions and finding the sum of terms
    Posted in the Algebra Forum
    Replies: 2
    Last Post: September 24th 2009, 10:53 AM
  4. finding logs in terms of another log
    Posted in the Algebra Forum
    Replies: 3
    Last Post: March 18th 2009, 12:54 PM
  5. Finding the next terms in series
    Posted in the Calculus Forum
    Replies: 2
    Last Post: April 22nd 2007, 10:45 AM

Search Tags


/mathhelpforum @mathhelpforum