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What is the domain of f(x) = 1/√(log₅ x)?

Answer and explanation

Correct answer: (1, ∞)

Because log₅x is under a square root in the denominator, two conditions are required: the logarithm must be defined and the square-root denominator must be strictly positive. The logarithm first requires x > 0. More importantly, √(log₅x) cannot be zero, so log₅x > 0. Since the base 5 is greater than 1, the logarithm is positive exactly when x > 1. Therefore the domain is (1, ∞), which is option C. Option A includes 0 < x ≤ 1, where log₅x is non-positive; option B incorrectly includes x = 1, making the denominator zero; and option D contains values for which log₅x is negative, so the square root is not real.

Related tags

DomainLogarithmRadicalDenominatorReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematics

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