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If f:{1,2,3}→{1,8,27} is defined by f(x)=x³, which are the ordered pairs of f?

Answer and explanation

Correct answer: {(1,1),(2,8),(3,27)}

A function can be represented by ordered pairs (x,f(x)), where the first component is the input from the domain and the second component is its corresponding output in the codomain. Apply f(x)=x³ to each domain element: f(1)=1³=1, f(2)=2³=8, and f(3)=3³=27. Consequently, the function is the set {(1,1),(2,8),(3,27)}, which is option A. Option B uses an unrelated pattern, while option C reverses the input-output roles in the latter pairs. Option D also does not follow the cube rule. Every first component in the correct set belongs to the domain {1,2,3}, and every second component belongs to the codomain {1,8,27}, confirming the representation.

Related tags

Relations FunctionsOrdered PairsFunction RuleFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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