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If \(f(x)=x^2\) and its domain is \(A=\{-1,0,1\}\), which idea does this function illustrate?

Answer and explanation

Correct answer: Two different inputs can have the same output

Here, \(f(-1)=(-1)^2=1\) and \(f(1)=1^2=1\). Thus, two different inputs can have the same output; such a function is many-one rather than one-one. Option B is incorrect because each input in a function must have exactly one output. Exam tip: to test whether a relation is a function, check that no single input is assigned two different outputs.

Related tags

Relations And FunctionsFunctionsMany-One FunctionSquare FunctionDomain And CodomainFunctions As A Special Kind Of RelationMathematicsClass 11 Mcq

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