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What is the real domain of f(x) = √(8 − x)?

Answer and explanation

Correct answer: (−∞, 8]

For a square-root function to have a real value, its radicand must be non-negative. Here the radicand is 8 − x, so we require 8 − x ≥ 0. Rearranging gives −x ≥ −8 and therefore x ≤ 8. Every real number less than 8 is allowed, and x = 8 is also allowed because √0 is defined. Thus the real domain is (−∞, 8], making option C correct. Option A reverses the inequality, option B incorrectly excludes the endpoint 8, and option D excludes 8 while allowing values greater than 8, which would make the radicand negative.

Related tags

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

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