Question 348745
 How do I write the domain of a function in set notation? 
Math problem: 
f(x)=(x^2 + 16)/x^2 - 3x - 28 
I have that the number that should be excluded from the domain is "7" 
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Factor where you can:
f(x) = (x^2+16)/[(x-7)(x+4)]
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"7" and "-4" are excluded
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Domain: (-oo,-4)U(4,7)U(7,+oo)
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Cheers,
Stan H.
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