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Choose the domain of f(x) = √(x − 3)/√(7 − x).

Answer and explanation

Correct answer: [3, 7)

The domain is found by applying separate square-root and denominator conditions. The numerator √(x − 3) is real when x − 3 ≥ 0, so x ≥ 3. The denominator √(7 − x) must also be real, requiring 7 − x ≥ 0, but it cannot equal zero because it is a denominator. Hence the stronger condition is 7 − x > 0, or x < 7. Combining x ≥ 3 with x < 7 gives [3, 7). The left endpoint 3 is included because the numerator becomes √0 while the denominator is √4, which is nonzero. The right endpoint 7 is excluded because the denominator becomes zero. Therefore option A is correct; B reverses endpoint inclusion, C incorrectly includes a zero denominator, and D violates the radicand conditions.

Related tags

Relations And FunctionsDomainRadicalsDenominator RestrictionReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematicsClass 11 Mcq

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