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What is the domain of f(x) = 1/√(x² − 10x + 24)?

Answer and explanation

Correct answer: (−∞, 4) ∪ (6, ∞)

Because the square root is in the denominator, its radicand must be strictly positive, not merely non-negative. Thus x² − 10x + 24 > 0. Factoring gives (x − 4)(x − 6) > 0. A product of two linear factors is positive outside its two roots, so the solution is x < 4 or x > 6. The points 4 and 6 must be excluded because they make the radicand zero and would place zero in the denominator. Therefore the domain is (−∞, 4) ∪ (6, ∞). Option B incorrectly includes the endpoints, option C selects the interval where the radicand is negative, and option D excludes only the roots while incorrectly retaining all points between them.

Related tags

Relations-FunctionsReal-Valued-FunctionsDomainRadical-DenominatorReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematics

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