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document.write( "Multiply the 30 by the -20, getting -600\r\n" );
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document.write( "Write down all the products of two integers which gives 600\r\n" );
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document.write( "600*1\r\n" );
document.write( "300*2\r\n" );
document.write( "100*3\r\n" );
document.write( "150*4\r\n" );
document.write( "120*5\r\n" );
document.write( "100*6\r\n" );
document.write( " 75*8\r\n" );
document.write( " 60*10\r\n" );
document.write( " 50*12\r\n" );
document.write( " 40*15 \r\n" );
document.write( " 30*20\r\n" );
document.write( " 25*24\r\n" );
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document.write( "Now out beside all those write their difference, \r\n" );
document.write( "since -600 is negative. (If it had been positive\r\n" );
document.write( "we would have found ther sum)\r\n" );
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document.write( "600*1 600-1 = 599\r\n" );
document.write( "300*2 300-2 = 298 \r\n" );
document.write( "100*3 100-3 = 97 \r\n" );
document.write( "150*4 150-4 = 146\r\n" );
document.write( "120*5 120-5 = 115 \r\n" );
document.write( "100*6 100-6 = 94\r\n" );
document.write( " 75*8 75-8 = 67\r\n" );
document.write( " 60*10 60-10 = 50\r\n" );
document.write( " 50*12 50-12 = 38\r\n" );
document.write( " 40*15 40-15 = 25\r\n" );
document.write( " 30*20 30-20 = 10\r\n" );
document.write( " 25*24 25-24 = 1\r\n" );
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document.write( "Notice that the coefficient of the middle term, 17,\r\n" );
document.write( "in absolute value, does not appear in the column of \r\n" );
document.write( "differences above. Therefore the trinomial does not factor.\r\n" );
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document.write( "Edwin
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document.write( "![\"\"](\"/images/stars/stars-13.gif\")
