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What is the range of f(x) = 5?

Answer and explanation

Correct answer: {5}

The governing concept is the range of a constant function. A range consists of all output values produced as the input varies over the domain. Here f(x) = 5 for every permitted x, so changing x never changes the output. Consequently, the only value in the range is 5, and the range is the singleton set {5}. It is not all of ℝ, because no value other than 5 is produced. It is not [5, ∞) or (−∞, 5], because those intervals contain many values that the function never takes. The braces are important: they denote a set containing exactly one element. Therefore option A is the only correct answer.

Related tags

Constant FunctionRangeSingleton SetReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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