Help writing the explicit formula
Favorites|Homepage
Subscriptions | sitemap
HOME > Mathematics > Help writing the explicit formula

Help writing the explicit formula

[From: ] [author: ] [Date: 11-05-09] [Hit: ]
Thus, the 5th term is 243.......
Write explicit formula, find 5th term
a1= 3
r= -3

-
Geometric sequence formula:

An = A₁r^(n - 1)

You have A₁ = 3, r = -3.
An = (3)(-3)^(n - 1)

Since we also know that we're finding the 5th term, so n = 5, and thus we're trying to find A₅:
A₅ = (3)(-3)^(5 - 1)
A₅ = (3)(-3)^4
A₅ = (3)(81)
A₅ = 243

Thus, the 5th term is 243.

Hope this helps :D

-
hint:
3 x r^4 =a5
1
keywords: the,explicit,Help,writing,formula,Help writing the explicit formula
New
Hot
© 2008-2010 http://www.science-mathematics.com . Program by zplan cms. Theme by wukong .