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What is the range of the constant function \(f(x)=-4\), defined for real numbers?

Answer and explanation

Correct answer: \(\{-4\}\)

This is a constant function, so for every real \(x\), the output is always \(-4\). Therefore, its range is the singleton set \(\{-4\}\). Options B and D are intervals, but this function never produces any value other than \(-4\). Exam tip: the range of a constant function is the set containing its single constant value.

Related tags

Constant FunctionRangeReal Valued FunctionsRelations And FunctionsClass 11Their Domain And RangeReal Valued Functions Their Domain And RangeMathematics

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