SOLUTION: 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"

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"
But I do not know how to write the domain of the function in set notation?
Thank you
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
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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