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If f(x) = ⌈x⌉ and x ∈ (-2, 2], what is the range of f?

Answer and explanation

Correct answer: {-1, 0, 1, 2}

The governing concept is the ceiling function: ⌈x⌉ is the least integer greater than or equal to x. The interval begins just above -2, so x = -2 is excluded, but numbers such as -1.9 have ceiling -1. Values from -2 up to -1 have ceiling -1; values in (-1, 0] have ceiling 0; values in (0, 1] have ceiling 1; and values in (1, 2] have ceiling 2. Every listed integer is attained, while -2 cannot be attained because x is never equal to or below -2. Hence the range is {-1, 0, 1, 2}, making option A correct. Option B incorrectly includes -2, C is the domain, and D omits -1.

Related tags

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

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