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What is the domain of f(x) = 1/log₃x?

Answer and explanation

Correct answer: (0, ∞) − {1}

The governing concept is finding a domain by applying every restriction in the formula. For log₃x to exist, its argument must be positive, so x > 0. In addition, the logarithm is in the denominator, and a denominator cannot be zero. Therefore log₃x ≠ 0. Since log₃1 = 0, we must exclude x = 1. Combining both conditions gives x > 0 and x ≠ 1, or the interval set (0, ∞) − {1}. Notice that all positive numbers other than 1 are allowed; for example, log₃3 = 1 and log₃(1/3) = −1 are both defined and nonzero. Thus option A is correct. Option B incorrectly includes 1, option C incorrectly includes non-positive numbers, and option D wrongly excludes values between 0 and 1.

Related tags

Relations And FunctionsDomainLogarithmic FunctionDenominator RestrictionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematicsClass 11 Mcq

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