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

Answer and explanation

Correct answer: (1, 4]

The governing rules are that a real square root requires its radicand to be nonnegative, and a denominator cannot be zero. For 1/√(x − 1), the radicand condition is x − 1 ≥ 0, but because the square root is in the denominator, √(x − 1) must actually be positive; therefore x − 1 > 0, or x > 1. For √(4 − x), we need 4 − x ≥ 0, giving x ≤ 4. Intersecting these conditions gives 1 < x ≤ 4, or (1, 4]. Thus option A is correct. Option B wrongly includes x = 1, C wrongly excludes x = 4, and D ignores the second radical.

Related tags

Real-Valued-FunctionsDomainRadicalsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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