document.write( "Question 1083729: how to get the ninth term?
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Algebra.Com's Answer #697758 by rothauserc(4718)\"\" \"About 
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we are given -2,16, -54, 128,\r
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\n" ); document.write( "a(n) = -1^n * 2n^3
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\n" ); document.write( "a(9) = -1^9 * (2*9^3) = -1458
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