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What is the sum of the first five terms of the geometric series 2 − 8 + 32 − . . . ?

 Oct 11, 2017
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Sum =F x (1 - R^N) / (1 - R)

Sum =2 x (1 -(-4)^5) / (1 - (-4))

Sum =2 x (1 - (-1024)) / (1 +4)

Sum =2 x (1,025) /(5)

Sum = 2,050 / 5

Sum= 410

 Oct 11, 2017

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