Asked by Timofey
Find the sum of the terms of the finite geometric sequence 1, -2, 4, -8, ...,-8192.
Answers
Answered by
bobpursley
a1=1, r=-2.
calculate which term (n=?) for an=-8192.
then use the formula for the sum
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?
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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