A net of a rectangular prism has 3 pairs of equal sides. The front face has an area of 30 feet squared.
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If you wrote the expression correctly, then
Is a polynomial, and thus defined everywhere: its domain is the set of all real numbers.
If, by chance, you meant
Then we must exclude the point x=4 from the domain, since that value would cause the denominator to vanish. So, the domain would be the set of real numbers, minus the number 4.