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What is the sum of the first eight terms of the geometric series where a1 = 2 and r = −5?

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

Sum =2 x (1 - (-5)^8) / (1 - (-5))

Sum =2 x (1 - (390,625)) / (1 + 5)

Sum =2 x (-390,624) / 6

Sum = -781,248 / 6

Sum = -130,208

 Oct 11, 2017

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