SOLUTION: how to get the ninth term? -2,16, -54, 128,

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Question 1083729: how to get the ninth term?
-2,16, -54, 128,
Answer by rothauserc(4718) About Me  (Show Source):
You can put this solution on YOUR website!
we are given -2,16, -54, 128,
The formula for the nth term is
:
a(n) = -1^n * 2n^3
:
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a(9) = -1^9 * (2*9^3) = -1458
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