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Let A={−2,−1,0,1,2} and f:A→Z be defined by f(x)=x²−1. What is the range of f?

Answer and explanation

Correct answer: {−1,0,3}

The range is the set of distinct output values produced by applying the function to every element of its specified domain. Calculate f(x)=x²−1 for each x in A. We get f(-2)=4−1=3, f(-1)=1−1=0, f(0)=0−1=-1, f(1)=1−1=0, and f(2)=4−1=3. Thus the list of outputs is 3,0,-1,0,3. Repeated values are written only once in a set, so the range is {-1,0,3}. Therefore option A is correct. Option B lists squares without subtracting 1, option C contains values not generated by the given domain, and option D incorrectly assumes every integer is obtained even though the domain is finite.

Related tags

FunctionsRangeDomain-And-RangeReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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