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If \(f(x)=\frac{1}{x-1}+\frac{1}{x+2}\), what is its domain?

Answer and explanation

Correct answer: \(\mathbb{R}\setminus\{1,-2\}\)

In a rational function, every denominator must be non-zero. Here, \(x-1=0\) gives \(x=1\), and \(x+2=0\) gives \(x=-2\); hence both values must be excluded from the domain. Therefore, the domain is \(\mathbb{R}\setminus\{1,-2\}\). Option B incorrectly changes \(-2\) to \(2\). Exam tip: set each denominator equal to zero and exclude all resulting values from the real numbers.

Related tags

DomainRational FunctionsReal-Valued FunctionsRelations And FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematicsClass 11 Mcq

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