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If f(x) = √(2 − |x − 1|), what is the range of f?

Answer and explanation

Correct answer: [0, √2]

First impose the real-valued condition for the square root: 2 − |x − 1| ≥ 0, or |x − 1| ≤ 2. The expression inside the radical therefore varies from 0 to 2. Its maximum 2 occurs at x = 1, while the minimum 0 occurs at x = −1 and x = 3. Because the square-root function is nonnegative and increasing on nonnegative inputs, taking the square root changes the interval [0, 2] into [0, √2]. Both endpoints are actually attained, so they must be included. Hence option A is correct. Option B confuses the radicand with the function value, option C incorrectly permits negative outputs, and option D excludes attainable endpoint values.

Related tags

Relations-FunctionsRangeAbsolute-ValueReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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