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

Answer and explanation

Correct answer: (-∞,-7] ∪ [3,∞)

The radicand of a real square root must be at least zero. Therefore |x+2|−5 ≥ 0, which is equivalent to |x+2| ≥ 5. For an absolute-value inequality of the form |u|≥a, we have u≤−a or u≥a. Hence x+2≤−5 or x+2≥5, giving x≤−7 or x≥3. The boundary values are included because the radicand equals zero there. Consequently the domain is (-∞,-7]∪[3,∞), option A. Option B and option C describe the central interval, where |x+2|<5 and the radicand is negative. Option D includes all real numbers, including values that do not produce a real square root.

Related tags

DomainAbsolute-ValueRadical-FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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