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What is the domain of f(x) = sqrt(x + 4) + 1/(x - 1)?

Answer and explanation

Correct answer: [-4, ∞) \ {1}

For a sum of real-valued expressions, every term must be defined at the same input. The radical term requires x + 4 ≥ 0, which gives x ≥ -4. The rational term requires x - 1 ≠ 0, so x ≠ 1. Combining these restrictions means we begin with [-4, ∞) and remove the single point 1. The endpoint -4 is allowed because sqrt(0) is defined, whereas 1 is excluded because it makes the denominator zero. Therefore the domain is [-4, ∞) \ {1}, which is option A. Option B incorrectly excludes -4, C omits all values above 1, and D includes values less than -4 where the square root is not real.

Related tags

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

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