document.write( "Question 1076234: Write the series using summation notation -3+17+117+... \n" ); document.write( "
Algebra.Com's Answer #690956 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "There are many possibilities\r\n" );
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document.write( "Could be this way:\r\n" );
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document.write( "51-8 = 5-8 = -3\r\n" );
document.write( "52-8 = 25-8 = 17\r\n" );
document.write( "53-8 = 125-8 = 117\r\n" );
document.write( "54-8 = 625-8 = 617\r\n" );
document.write( "...\r\n" );
document.write( "\"sum%28%285%5Ek-8%29%2Ck=1%2Cn%29\"\r\n" );
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document.write( "------------------------------\r\n" );
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document.write( "Or it could be this way:\r\n" );
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document.write( "-3+20 = 17\r\n" );
document.write( "17+100 = 117\r\n" );
document.write( "117+180 = 297\r\n" );
document.write( "297+260 = 557\r\n" );
document.write( "...\r\n" );
document.write( "where we add terms of the arithmetic sequence 20,100,280,260,...\r\n" );
document.write( "to each term to get the next term.\r\n" );
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document.write( "And the general term is ak = 40k2-100k+57\r\n" );
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document.write( "\"sum%28%2840k%5E2-100k%2B57%29%2Ck=1%2Cn%29\"\r\n" );
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document.write( "But there are trillions of other sequences that have -3,17,117\r\n" );
document.write( "for their first three terms.  So how on earth could your teacher\r\n" );
document.write( "expect you or anybody to guess which one he or she had in mind??\r\n" );
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document.write( "Edwin
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