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The expression is undefined when the denominator is 0.
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document.write( "Factor it:
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document.write( "Set each = 0 to find the x-value that makes it 0.
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document.write( "z+1 = 0
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document.write( "Subtract 1 from both sides.
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document.write( "z=-1
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document.write( "z-5=0
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document.write( "Add 5 to both sides.
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document.write( "z=5
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document.write( "The expression is undefined when z=-1 and when z=5.\r
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