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

Answer and explanation

Correct answer: (-2, ∞)

The governing rule is that a square root requires its radicand to be non-negative, while a denominator must be non-zero. Here, x + 2 occurs under a square root and the entire square root is in the denominator, so we need x + 2 > 0, not merely x + 2 ≥ 0. Solving gives x > -2. Therefore, the domain is (-2, ∞), including every real number greater than -2 but excluding -2 itself, because at x = -2 the denominator becomes zero. The added constant 5 changes output values only and does not impose any new restriction. Hence option A is correct; option B incorrectly includes -2, while C reverses the inequality and D excludes only one point without applying the radical condition.

Related tags

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

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