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

Answer and explanation

Correct answer: [-1, ∞) \ {2}

For a real-valued function, every square-root radicand must be nonnegative, and every denominator must be nonzero. The radical condition is x + 1 ≥ 0, which gives x ≥ −1. The rational term requires x − 2 ≠ 0, so x ≠ 2. Combining these restrictions gives the domain [−1, ∞) excluding 2, written [−1, ∞) \ {2}. The endpoint −1 is included because √0 is defined, whereas 2 is removed because division by zero is undefined. Option A correctly includes −1 and excludes 2. Option B wrongly excludes −1; option C excludes many valid values; option D includes values less than −1, where the square root is not real.

Related tags

Real-Valued-FunctionsDomainRadicals-And-Rational-FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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