SOLUTION: This is the second part of my first question: Evaluate the series: 9-3+1-1/3+... Thank you.

Algebra ->  Sequences-and-series -> SOLUTION: This is the second part of my first question: Evaluate the series: 9-3+1-1/3+... Thank you.      Log On


   

Question 986528: This is the second part of my first question:
Evaluate the series:
9-3+1-1/3+...
Thank you.
Answer by Edwin McCravy(20066) About Me  (Show Source):
You can put this solution on YOUR website!
a1 = first term = 9
r = -1%2F3 = common ratio

First substitute those in this equation: 

S%5Binfinity%5D%22%22=%22%22a%5B1%5D%2F%281-r%29

Then simplify by multiplying top and bottom by LCD= 3

If you have trouble completing it, ask me in the 
thank-you note form below.

Edwin