SOLUTION: Find the sum of the first 10 terms of the geometric series 4-8+16-32+64

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Question 1001480: Find the sum of the first 10 terms of the geometric series 4-8+16-32+64
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
There is a closed form solution for this, but without that at my finger tips I would suggest looking at pairs...
4-8 = -4
16-32 = -16
64-128 = -64
256-512 = -256
1024-2048 = -1024
Add 'em up and get
-1364