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What is the range of f: R → R defined by f(x) = 9?

Answer and explanation

Correct answer: {9}

The governing concept is that the range is determined by actual outputs, not merely by the stated codomain. Since f(x) = 9 for every real x in the domain R, the function is constant. Substituting any input, such as 0, 4, or −10, gives the same output 9. Thus the set of all attainable outputs contains exactly one element: Range(f) = {9}. Hence option A is correct. Option B is the codomain and is not the range of this constant function. Option C would describe a function constantly equal to zero. Option D includes infinitely many values greater than or equal to 9, but none of those values except 9 is produced by f. The braces in {9} show that this is a singleton set.

Related tags

Constant FunctionRangeSingleton SetFunctionsRelations And FunctionsMathematicsClass 12 Mcq

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