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What is the domain of f(x)=1/√(x+2)+√(6−x)?

Answer and explanation

Correct answer: (-2,6]

The domain is obtained by intersecting the restrictions from both terms. In the first term, √(x+2) is in the denominator, so its radicand must be strictly positive: x+2>0, giving x>−2. Equality is forbidden because it would make the denominator zero. In the second term, √(6−x) is an ordinary square root, so 6−x≥0, giving x≤6; equality is allowed because √0 exists. Combining these conditions produces −2<x≤6, or (-2,6]. Therefore option A is correct. Option B incorrectly includes −2, option C incorrectly excludes the valid endpoint 6, and option D ignores the first term’s restriction. The intersection, not a union, is required because both terms must be defined simultaneously.

Related tags

DomainRadical-FunctionsDenominatorReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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