Quadratic equation  (in our case  ) has the following solutons:
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document.write( " For these solutions to exist, the discriminant  should not be a negative number.
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document.write( " First, we need to compute the discriminant :  .
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document.write( " Discriminant d=0 is zero! That means that there is only one solution:  .
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document.write( " Expression can be factored: 
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document.write( " Again, the answer is: -1, -1.\n" );
document.write( "Here's your graph:
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document.write( "![\"\"](\"/images/stars/stars-13.gif\")
