document.write( "Question 770156: Find all numbers that must be excluded from the domain of the rational expression.\r
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Algebra.Com's Answer #469323 by Edwin McCravy(20059)\"\" \"About 
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document.write( "Denominators can never = 0, so\r\n" );
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document.write( "   x² + 6x + 8 ≠ 0\r\n" );
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document.write( "(x + 4)(x + 2) ≠ 0\r\n" );
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document.write( "x + 4 ≠  0;  x + 2 ≠  0\r\n" );
document.write( "    x ≠ -4       x ≠ -2\r\n" );
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document.write( "So -4 and -2 must be excluded from the domain.\r\n" );
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document.write( "Edwin
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