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If \(I_A\) is the identity function defined on the set \(A=\{8,9\}\), what is the value of \(I_A(8)\)?

Answer and explanation

Correct answer: 8

An identity function maps every element to itself, so \(I_A(x)=x\). Therefore, \(I_A(8)=8\). Although 9 is also an element of set \(A\), it is not the image of 8 under the identity function. Exam tip: for an identity function, the input and output are always the same.

Related tags

RelationsFunctionsIdentity-FunctionFunction-EvaluationFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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