SOLUTION: Find the explicit formula for the geometric sequence with a1 = -3 and r = 2.

Algebra ->  Sequences-and-series -> SOLUTION: Find the explicit formula for the geometric sequence with a1 = -3 and r = 2.      Log On


   

Question 977413: Find the explicit formula for the geometric sequence with a1 = -3 and r = 2.
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
a%5Bn%5D+=+a%5B1%5D%2A%28r%29%5E%28n-1%29

a%5Bn%5D+=+-3%2A%28r%29%5E%28n-1%29 Replace a%5B1%5D with -3

a%5Bn%5D+=+-3%2A%282%29%5E%28n-1%29 Replace r with 2

and that's all there is to it