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If f: R → R is defined by f(x) = 2, what is its range?

Answer and explanation

Correct answer: {2}

The governing concept is the range of a constant function. A range consists of all output values that the function actually produces as the input runs through its domain. Here the domain is R, but f(x) is always equal to 2, regardless of whether x is positive, negative, or zero. Consequently, every real input has the same image, 2, and no other output can occur. Therefore Range(f) = {2}, so option A is correct. Option B confuses the codomain R with the actual range. Option C would be correct only for the constant function f(x) = 0, while option D incorrectly suggests that every positive real number is attained. The singleton set notation is essential because the range contains exactly one value.

Related tags

Constant FunctionRangeCodomainFunctionsRelations And FunctionsMathematicsClass 12 Mcq

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