For the functions f(x) and g(x), determine the domain of (f - g)(x) (the difference of f and g).f(x) = 
, g(x) = 
A. {x ? x is a real number and x ? 3 and x ? -9}
B. {x ? x is a real number and x ? -3 and x ? 9}
C. {x ? x is a real number and x ? 3}
D. {x ? x is a real number}
Answer: A
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