Question: Suppose f : D R f:DR is a function defined by f ( x ) = x 2 16 x + 4 f(x)= x+4 x

Suppose f : D R f:DR is a function defined by f ( x ) = x 2 16 x + 4 f(x)= x+4 x 2 16 , where D R DR. Let A A be the set of integers which are not in the domain of f f, then find the cardinality of the set A A

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