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If f: {1,2,3,4} → {1,2,3,4} is given by f(x) = x² - 4x + 5, which statement is correct?

Answer and explanation

Correct answer: It is not a function because f(4) = 5, which is not in {1,2,3,4}

For a mapping f: A → B to be a function, every element of the domain A must have exactly one image, and that image must belong to the codomain B. Evaluate the rule on the four domain elements: f(1) = 1 - 4 + 5 = 2, f(2) = 4 - 8 + 5 = 1, f(3) = 9 - 12 + 5 = 2, and f(4) = 16 - 16 + 5 = 5. The first three outputs are in B, but 5 is not in {1,2,3,4}. Thus the stated mapping to B is not a function. Option C is correct. Repeated outputs, such as f(1) = f(3) = 2, are allowed; the problem is the output f(4) = 5 outside the codomain.

Related tags

Finite-FunctionCodomainFunction-RuleFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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