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What is the domain of f(x) = √((x − 2)(6 − x))/(x − 4)?

Answer and explanation

Correct answer: [2, 4) ∪ (4, 6]

For the square root to be real, (x − 2)(6 − x) must be at least zero. The factors show that this product is non-negative from x = 2 through x = 6, so the radical condition gives [2, 6]. The denominator adds the restriction x − 4 ≠ 0, meaning x ≠ 4. Removing 4 from [2, 6] gives [2, 4) ∪ (4, 6]. The endpoints 2 and 6 remain included because the radicand is zero there and the denominator is nonzero. Therefore option A is correct. Option B forgets the denominator restriction, C wrongly excludes the valid endpoints, and D includes many real numbers for which the radicand is negative.

Related tags

DomainRadicalDenominatorIntervalsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematics

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