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If f(x)=3x-2 and the domain is (-1,5], what is the range?

Answer and explanation

Correct answer: (-5,13]

The governing concept is mapping a domain interval through a real-valued function. Since f(x)=3x−2 has positive slope 3, it is strictly increasing, so the endpoint outputs determine the range. The lower domain endpoint −1 is excluded; its output is f(−1)=3(−1)−2=−5, which must also be excluded. The upper endpoint 5 is included; f(5)=15−2=13, so 13 is included. Hence the range is (−5,13], making option A correct. Option B incorrectly includes −5, option C merely repeats the domain, and option D uses an incorrect lower output. The open and closed brackets are essential because they reflect whether the corresponding domain endpoints are excluded or included.

Related tags

Real-Valued-FunctionsRangeLinear-FunctionReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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