SOLUTION: Find the sum of the first 8 terms in the geometric series 1-4+16-64+...

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Question 851021: Find the sum of the first 8 terms in the geometric series 1-4+16-64+...
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
t1*(1 - r^n)/(1 - r)
1*(1-(-4)^8)/(1-(-4))
-13107
1-4+16-64+256-1024+ 4096-16384