document.write( "Question 1074938: 7,9,-1,5, n what is n? \n" ); document.write( "
Algebra.Com's Answer #689668 by Edwin McCravy(20056)\"\" \"About 
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7,9,-1,5, n what is n?
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document.write( "One of many possible general equations for a sequence that has\r\n" );
document.write( "those first 4 terms is:\r\n" );
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document.write( "ax = (14x3-102x2+214x-105)/3  \r\n" );
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document.write( "Substitute x=1\r\n" );
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document.write( "a1 = [14(1)3-102(1)2+214(1)-105]/3 =\r\n" );
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document.write( "[14(1)-102(1)+214(1)-105]/3 = [14-102+214-105]/3 = \r\n" );
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document.write( "21/3 = 7\r\n" );
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document.write( "Substitute x=2\r\n" );
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document.write( "a2 = [14(2)3-102(2)2+214(2)-105]/3 =\r\n" );
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document.write( "[14(8)-102(4)+214(2)-105]/3 = [112-408+428-105]/3 = \r\n" );
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document.write( "27/3 = 9\r\n" );
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document.write( "Substitute x=3\r\n" );
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document.write( "a3 = [14(3)3-102(3)2+214(3)-105]/3 =\r\n" );
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document.write( "[14(27)-102(9)+214(3)-105]/3 = [378-918+642-105]/3 = \r\n" );
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document.write( "-3/3 = -1\r\n" );
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document.write( "Substitute x=4\r\n" );
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document.write( "a4 = [14(4)3-102(4)2+214(4)-105]/3 =\r\n" );
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document.write( "[14(64)-102(16)+214(4)-105]/3 = [896-1632+856-105]/3 = \r\n" );
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document.write( "15/3 = 5\r\n" );
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document.write( "Substitute x=5\r\n" );
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document.write( "a5 = [14(5)3-102(5)2+214(5)-105]/3 =\r\n" );
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document.write( "[14(125)-102(25)+214(5)-105]/3 = [1750-2550+1070-105]/3 = \r\n" );
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document.write( "165/3 = 55\r\n" );
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document.write( "Answer: n = 55.\r\n" );
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document.write( "Edwin

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