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If f(x) = x + 2 and the domain is [0, 3], what is the range?

Answer and explanation

Correct answer: [2, 5]

The governing concept is the image of a closed interval under a linear function. Since f(x) = x + 2 has positive slope 1, it is increasing throughout the domain [0, 3]. Thus the least output is obtained at the left endpoint: f(0) = 0 + 2 = 2. The greatest output is obtained at the right endpoint: f(3) = 3 + 2 = 5. Because both endpoints are included in the domain and the function is defined at them, the endpoint values 2 and 5 are included in the range. Therefore the range is [2, 5], making option B correct. Option A ignores the addition of 2, option C incorrectly excludes the endpoints, and option D uses an incorrect lower endpoint.

Related tags

RangeLinear FunctionsInterval DomainReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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