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What is the domain of f(x) = 1/log₂x?

Answer and explanation

Correct answer: (0, ∞) \ {1}

A logarithm log₂x is defined only when its argument is positive, so x > 0. There is an additional restriction because the logarithm appears in the denominator: log₂x must not equal zero. Since log₂1 = 0, x = 1 must be excluded. No other positive x is excluded, because the base 2 is valid and log₂x is defined for every x > 0. Consequently, the domain is (0, ∞) \ {1}. Option B includes x = 1 even though division by zero would occur. Option C wrongly allows negative x, where the real logarithm is undefined, and option D omits valid values between 0 and 1. Both the logarithm condition and denominator condition are essential.

Related tags

Relations-FunctionsReal-Valued-FunctionsDomainLogarithmReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematics

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