SOLUTION: given the explicit formula for a geometric sequence is an=3(-2)n-1. What is the fifth term of the sequence? I came up with a5= 1296, but am not sure.

Algebra ->  Sequences-and-series -> SOLUTION: given the explicit formula for a geometric sequence is an=3(-2)n-1. What is the fifth term of the sequence? I came up with a5= 1296, but am not sure.       Log On


   

Question 871901: given the explicit formula for a geometric sequence is an=3(-2)n-1. What is the fifth term of the sequence? I came up with a5= 1296, but am not sure.
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
an=3(-2)n-1.
you have to plug n=5 for 5th term
a5=3(-2)5-1.
a5 = -30-1
=-31