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interval notation

use interval notation to indicate the domain of f(x)
 
f(x)= x-4/ x^2-7x-8

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Parviz F. | Mathematics professor at Community CollegesMathematics professor at Community Colle...
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 f(x) =  ( X -4 ) / (X2 -7x - 8) = ( X - 4 ) / ( X - 8 ) ( X + 1)
 
   Domain:
                   X ε ( - ∞, -1) U X ε( -1, 8) u xε ( 8 ,+∞)