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If \(f(x)=|x-4|+2\), where \(x\in\mathbb{R}\), what is the range of \(f\)?

Answer and explanation

Correct answer: \([2,\infty)\)

Since \(|x-4|\ge 0\), we have \(f(x)=|x-4|+2\ge 2\). At \(x=4\), \(|x-4|=0\), so \(f(4)=2\); therefore, the value 2 is attained. As \(|x-4|\) increases, all values greater than 2 are also obtained, giving the range \([2,\infty)\). Option B is incorrect because it excludes the attained minimum value 2. Exam tip: For a function of the form \(|x-a|+b\), the range is \([b,\infty)\).

Related tags

Relations-FunctionsReal-Valued-FunctionsRangeModulus-FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematics

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