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If the domain of the function \(f(x)=\frac{1}{x-a}\) is \(\mathbb{R}\setminus\{5\}\), what is the value of \(a\)?

Answer and explanation

Correct answer: 5

The denominator \(x-a\) must not be zero. Thus, the only excluded value from the domain is obtained from \(x-a=0\), which gives \(x=a\). Since the excluded value is \(5\), we have \(a=5\). Choosing \(-5\) would exclude \(-5\), not \(5\). Exam tip: For a reciprocal expression, set its denominator equal to zero to identify the value excluded from the domain.

Related tags

Relations And FunctionsDomain And RangeReal Valued FunctionsRational FunctionsParameterTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematics

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