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If \(f:A\to A\) is a function such that \(f(x)=x\) for every \(x\in A\), what type of function is \(f\)?

Answer and explanation

Correct answer: Identity function

In an identity function, every element of the set maps to itself, so \(f(x)=x\). Hence, \(f\) is the identity function on \(A\), also denoted by \(I_A\). It is not a constant function because a constant function maps every element to the same fixed value. Exam tip: whenever \(f(x)=x\) for every element of the domain, identify the function as an identity function.

Related tags

FunctionsIdentity-FunctionRelationsDefinitionsFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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