SOLUTION: What is the nth term of 4 4 0 -8 -20?? I was also given that the nth term of 2 2 0 -4 -10 Is 3n-n2 (n squared)

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Question 1032025: What is the nth term of
4 4 0 -8 -20??

I was also given that the nth term of
2 2 0 -4 -10
Is 3n-n2 (n squared)
Found 2 solutions by fractalier, stanbon:
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Since each term in the question is double what you were given, one would suspect that the factor two plays a crucial role...how about
a%5Bn%5D+=+2%283n+-+n%5E2%29+=+6n+-+2n%5E2?

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!

Sequences-and-series/1032025 (2016-04-28 15:11:53): What is the nth term of
4 4 0 -8 -20??
I ran a quadratic regression program on the data and got the following::
a(n) = -2n^2 + 6n
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I was also given that the nth term of
2 2 0 -4 -10
Is a(n) = 3n-n^2 ----correct
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Cheers,
Stan H.
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