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If \(f:\mathbb{N}\to\mathbb{N}\) is defined by \(f(x)=x+2\), what is the value of \(f(5)\)?

Answer and explanation

Correct answer: 7

Substituting \(x=5\) into the given rule gives \(f(5)=5+2=7\). Hence, the correct value is 7. The value 5 is only the input, not the output of the function. Exam tip: To find a function value, substitute the given input directly into the function rule.

Related tags

Relations-FunctionsFunction-ValueNatural-NumbersFunction-EvaluationFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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