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Let \(A=\{1,2,3,4\}\) and define \(f:A\to\mathbb{Z}\) by \(f(x)=(-1)^x\). What is the range of \(f\)?

Answer and explanation

Correct answer: \(\{-1,1\}\)

The odd elements of \(A\), namely \(1\) and \(3\), give \((-1)^x=-1\). The even elements, \(2\) and \(4\), give \((-1)^x=1\). Therefore, the set of all output values is \(\{-1,1\}\). The choices \(\{1\}\) and \(\{-1\}\) omit the outputs from odd and even inputs, respectively. Exam tip: \((-1)^x\) equals \(-1\) for an odd exponent and \(1\) for an even exponent.

Related tags

Relations And FunctionsRange Of A FunctionPower FunctionDomain And RangeReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematicsClass 11 Mcq

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