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What is the domain of the function \(f(x)=\frac{1}{|x-4|-1}\)?

Answer and explanation

Correct answer: \(\mathbb{R}\setminus\{3,5\}\)

The denominator of a rational function cannot be zero. Thus, \(|x-4|-1\ne0\), or \(|x-4|\ne1\). Hence, \(x-4=1\) or \(x-4=-1\), giving \(x=5\) or \(x=3\). Therefore, the domain is all real numbers except 3 and 5: \(\mathbb{R}\setminus\{3,5\}\). Option B incorrectly excludes 4; at \(x=4\), the denominator is \(-1\), so the function is defined. Exam tip: for a rational function, exclude every input that makes the denominator zero.

Related tags

Real-Valued-FunctionsDomainModulusRational-FunctionsRelations-And-FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And Functions

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