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Choose the range of f(x) = √(9 − (x − 1)²).

Answer and explanation

Correct answer: [0, 3]

The governing concept is the range of a square-root function. A square root always produces a non-negative output, so f(x) cannot be less than 0. Also, the expression inside the root is 9 − (x − 1)². Its largest possible value is 9, attained when x = 1. Therefore the largest function value is √9 = 3. The value 0 is also attained when (x − 1)² = 9, namely at x = −2 or x = 4. As x varies over the domain [−2, 4], the inside expression covers every value from 0 to 9, so the output covers every value from 0 to 3. Hence the range is [0, 3], making option A correct. Option B incorrectly includes negative outputs, option C excludes the attained value 0, and option D confuses the radicand with the function value.

Related tags

Relations And FunctionsRangeSquare Root FunctionDomainReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematicsClass 11 Mcq

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