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What is the domain of f(x) = √(x + 2) / √(7 − x)?

Answer and explanation

Correct answer: [−2, 7)

Two separate restrictions must be applied. The numerator √(x + 2) is real when x + 2 ≥ 0, so x ≥ −2. The denominator √(7 − x) must be real and also nonzero because it is in the denominator. Thus 7 − x > 0, giving x < 7. Intersecting x ≥ −2 with x < 7 produces [−2, 7). The left endpoint is allowed because the numerator becomes √0, which is defined, while the right endpoint is forbidden because the denominator becomes zero. Hence option A is correct. Option B incorrectly includes x = 7, option C incorrectly excludes x = −2, and option D reverses the relevant interval conditions.

Related tags

DomainRadicalsQuotientReal-Valued-FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematics

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