SOLUTION: Find the sum of the first 5 terms of the sequence defined by an = -7(-4)n − 1 for n ≥ 1.

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Question 752362: Find the sum of the first 5 terms of the sequence defined by an = -7(-4)n − 1 for n ≥ 1.
Answer by stanbon(75887) About Me  (Show Source):
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Find the sum of the first 5 terms of the sequence defined by an = -7(-4)n − 1 for n ≥ 1.
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a(1) = -7(-4)1-1 = 27
a(2) = -7(-4)2-1 = 55
a(3) = -7(-4)3-1 = 83
a(4) = -7(-4)4-1 = 111
a(5) = 139
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Sum = 415
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Cheers,
Stan H.
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