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What is the domain of f(x)=√(12−x−x^2)?

Answer and explanation

Correct answer: [-4,3]

For a real-valued square root, its radicand must be nonnegative. Hence 12−x−x^2 ≥ 0. Rearranging gives x^2+x−12 ≤ 0, and factoring gives (x+4)(x−3) ≤ 0. A product of these two linear factors is nonpositive between the roots, including both roots because equality makes the radicand zero and √0 is defined. Therefore −4≤x≤3, so the domain is [-4,3], option A. Option C wrongly excludes the endpoints. Option B selects the outside intervals, where the radicand is negative, and option D includes values for which the square root is not real.

Related tags

DomainRadical-FunctionsQuadratic-InequalityReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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