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Use the formula for the sum of the first n terms of a geometric sequence to solve. Find the sum of the first 8 terms of the geometric sequence: -8, -16, -32, -64, -128, . . . . A. -2003 B. -2040 C. -2060 D. -2038
Find the sum of the first 8 terms of the geometric sequence: -8, -16, -32, -64, -128,is -2040. common ratio = -128/-64 = 2 Sum of first 8 term = -8*(1-2^8)/(1-2) = -8*255/-1 = -2040 .
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Asked 11/18/2014 12:50:02 PM
Updated 11/19/2014 12:20:22 AM
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Find the sum of the first 8 terms of the geometric sequence: -8, -16, -32, -64, -128,is -2040.
common ratio = -128/-64 = 2
Sum of first 8 term = -8*(1-2^8)/(1-2) = -8*255/-1 = -2040 .
Added 11/19/2014 12:20:22 AM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [11/19/2014 12:39:03 AM]
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