Asked by Timofey

Find the sum of the terms of the finite geometric sequence 1, -2, 4, -8, ...,-8192.
Answered by bobpursley
a1=1, r=-2.

calculate which term (n=?) for an=-8192.

then use the formula for the sum
Answered by Timofey
How do i find the sum?
Answered by Timofey
I have sum of 2731 is correct?
Answered by Steve
Can't be that, since the sign of the last term determines the sign of the sum:

1
1-2 = -1
-1 + 4 = +3
3 - 8 = -5
-5 + 16 = +11
...

What did you get for n where An = -8192?
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