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What is the range of the function f(x) = √(4 − x²)?

Answer and explanation

Correct answer: [0, 2]

First, the radicand must satisfy 4 − x² ≥ 0, so the domain is −2 ≤ x ≤ 2. Since f(x) is a principal square root, its output can never be negative. The largest value of 4 − x² occurs when x = 0, giving f(0) = √4 = 2. At x = −2 or x = 2, the value is √0 = 0. As x varies through the domain, the function takes every value from 0 to 2; geometrically, its graph is the upper semicircle x² + y² = 4. Therefore the range is [0, 2], so option A is correct. Option B wrongly includes negative outputs, option C confuses the radicand with the function value, and option D includes values below zero.

Related tags

Relations And FunctionsRangeRadical FunctionReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematicsClass 11 Mcq

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