document.write( "Question 1065739: Factor.
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Algebra.Com's Answer #680946 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "9x2-5x-10\r\n" );
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document.write( "This trinomial cannot be factored, so whenever you find\r\n" );
document.write( "one like that in a set of problems, you simply write the \r\n" );
document.write( "word \"prime\".\r\n" );
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document.write( "How to tell if a trinomial Ax2+Bx+C is prime:\r\n" );
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document.write( "Calculate B2-4AC = (-5)2-4(9)(-10) = 25+360 = 385.\r\n" );
document.write( "This is not a perfect square, because the square root of\r\n" );
document.write( "385 is 19.62141687..., not a whole number.  So the trinomial \r\n" );
document.write( "is prime, that is, it cannot be factored. \r\n" );
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document.write( "Edwin
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