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document.write( "Hi, \n" );
document.write( "how to factor \n" );
document.write( "The idea is to position the -4 and -1 so as SUM of the outside and the inside terms = -13x \n" );
document.write( "3x^2-13x+4 = (3x __)(x __) = (3x - 1)(x - 4)\r \n" );
document.write( "\n" );
document.write( " F First terms 3x^2 \n" );
document.write( " O Outside terms -12x \n" );
document.write( " I Inside terms -x \n" );
document.write( " L Last terms 4 \n" );
document.write( "