\r\n" );
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\r\n" );
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document.write( "Square both sides:\r\n" );
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document.write( "

\r\n" );
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document.write( "

\r\n" );
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document.write( "

\r\n" );
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document.write( " 

\r\n" );
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document.write( " 

\r\n" );
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document.write( "There are no sign changes, so by Descartes' rule of signs,\r\n" );
document.write( "there are no positive roots.\r\n" );
document.write( "\r\n" );
document.write( "However any non-positive value of x would cause the left\r\n" );
document.write( "side of the equation\r\n" );
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document.write( "

\r\n" );
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document.write( "to be the square root of a negative number, which is not a real \r\n" );
document.write( "number.\r\n" );
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document.write( "Therefore there are no real solutions.\r\n" );
document.write( "\r\n" );
document.write( "Edwin
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document.write( "