Results 1 to 3 of 3

Thread: expressions

  1. #1
    Newbie
    Joined
    Feb 2010
    Posts
    3

    expressions

    hi, i have a math problem

    Term ......... . . Pattern
    _________l__________________

    ...1 ............. 2
    ... 2 ............. 6
    ...3 ............. 18
    ...4 ............. 54
    ...5 ............. 162



    so the pattern is start at 2 times 3 each time. but i need a expression

    ex. n+5

    N is the term, N and something else has to give me the pattern

    please help me
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Prove It's Avatar
    Joined
    Aug 2008
    Posts
    12,880
    Thanks
    1946
    Quote Originally Posted by ashimashi View Post
    hi, i have a math problem

    Term ......... . . Pattern
    _________l__________________

    ...1 ............. 2
    ... 2 ............. 6
    ...3 ............. 18
    ...4 ............. 54
    ...5 ............. 162



    so the pattern is start at 2 times 3 each time. but i need a expression

    ex. n+5

    N is the term, N and something else has to give me the pattern

    please help me
    This is a geometric sequence, with $\displaystyle t_1 = 2, r = 3$.

    In a geometric sequence $\displaystyle t_{n + 1} = rt_{n}$.


    So $\displaystyle t_2 = 3\cdot 2$

    $\displaystyle t_3 = 3\cdot 3 \cdot 2$

    $\displaystyle t_4 = 3\cdot 3\cdot 3 \cdot 2$...


    Can you see that $\displaystyle t_{n + 1} = 2\cdot 3^n$?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Feb 2010
    Posts
    3
    kk thank you
    Last edited by ashimashi; Feb 20th 2010 at 04:53 PM.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. More expressions
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: Mar 13th 2010, 01:50 PM
  2. Rational Expressions and Radical Expressions
    Posted in the Algebra Forum
    Replies: 16
    Last Post: Jul 9th 2009, 09:29 PM
  3. Some expressions
    Posted in the Math Topics Forum
    Replies: 4
    Last Post: Oct 29th 2008, 11:48 AM
  4. 3 Xor expressions
    Posted in the Discrete Math Forum
    Replies: 5
    Last Post: Aug 2nd 2007, 10:27 AM
  5. Expressions
    Posted in the Algebra Forum
    Replies: 1
    Last Post: Feb 1st 2007, 07:28 PM

Search Tags


/mathhelpforum @mathhelpforum