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What is the domain of f(x) = 1/√(|x + 2| − 5)?

Answer and explanation

Correct answer: (−∞, −7) ∪ (3, ∞)

Because the square root is in the denominator, its radicand must be strictly positive: |x + 2| − 5 > 0. Hence |x + 2| > 5. Splitting the absolute-value inequality gives x + 2 > 5 or x + 2 < −5, so x > 3 or x < −7. The boundary values x = 3 and x = −7 make the radicand zero, producing a zero denominator, and are therefore excluded. All values outside these two boundaries make the radicand positive. Thus the domain is (−∞, −7) ∪ (3, ∞), which is option A. Option B incorrectly includes the zero-denominator boundaries, C gives the region where the radicand is not positive, and D fails to exclude the whole interval between the boundaries.

Related tags

Relations-FunctionsDomainAbsolute-ValueReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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