SOLUTION: find the sum of the first nine terms of the geometric sequence
8, -16, 32, -64, 128....
Algebra.Com
Question 985810: find the sum of the first nine terms of the geometric sequence
8, -16, 32, -64, 128....
Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website!
.
The first term is = 8.
The common ratio is = -2.
The sum of the first 9 terms is
= . = . = . = . = 8*171 = 1368.
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