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If \(f:\mathbb{R}\to\mathbb{R}\) is defined by \(f(x)=|2x-1|+3\), what is the range of \(f\)?

Answer and explanation

Correct answer: \([3,\infty)\)

For every real \(x\), \(|2x-1|\ge 0\), so \(f(x)\ge 3\). At \(x=\frac{1}{2}\), the absolute-value term is zero and \(f(x)=3\), so the minimum is attained. As \(|2x-1|\) can grow without bound, the range is \([3,\infty)\).

Related tags

RangeAbsolute-ValueReal-Valued-FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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