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What is the range of f(x) = 3 − |x|?

Answer and explanation

Correct answer: (−∞, 3]

The governing concept is the effect of the absolute-value term on the output. For every real x, |x| ≥ 0, so 3 − |x| ≤ 3. Equality occurs at x = 0, giving f(0) = 3; hence the upper endpoint is included. There is no lower bound: for any large positive number M, taking x = 3 + M gives f(x) = 3 − (3 + M) = −M. Thus arbitrarily negative values occur, while no value greater than 3 can occur. The range is (−∞, 3]. Option B reverses the direction of the bound, option C incorrectly imposes a lower bound of zero, and option D incorrectly includes values above 3.

Related tags

RangeModulus FunctionAbsolute ValueReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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