document.write( "Question 673222: The second term in a geometric series is 36. The sum of the first two terms is -18. What is the first term and the common ratio? what is the sum to infinty of the series? \n" ); document.write( "

Algebra.Com's Answer #418597 by Edwin McCravy(20059) $\"\"$ $\"About$

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document.write( "The second term in a geometric series is 36. The \r\n" );
document.write( "sum of the first two terms is -18. What is the first \r\n" );
document.write( "term and the common ratio? \r\n" );
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document.write( "what is the sum to infinity of the series?\r\n" );
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document.write( "Let the first term be x.\r\n" );
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document.write( "The sum of the first two terms is 18\r\n" );
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document.write( "So \r\n" );
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document.write( "x + 36 = 18\r\n" );
document.write( "     x = -18\r\n" );
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document.write( "Common ratio =  =  = -2\r\n" );
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document.write( "Therefore the sum to infinity is undefined because in order to\r\n" );
document.write( "have a sum to infinity, the common ratio must be between -1 and 1,\r\n" );
document.write( "exclusive of both.\r\n" );
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document.write( "Edwin

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