Simplify. Identify any x values for which the expression is undefined.
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This will be undefined when
-x^2 -9x - 20 = 0 multiply through by -1
x^2 + 9x + 20 = 0 factor
(x + 4) ( x + 5) = 0
Setting both factors to 0 and solving for x we have that the function will be undefined
whenever x = - 4 or x = - 5