Example

Determining the Domain of the Radical Function g(x)=6x1g(x) = \sqrt{\frac{6}{x - 1}}

To determine the domain of the radical function g(x)=6x1g(x) = \sqrt{\frac{6}{x - 1}}, note that the radical has an even index of 2. For the function to evaluate to a real number, its radicand must be non-negative (6x10\frac{6}{x - 1} \geq 0). Because the numerator is a positive constant (6), the rational expression will be non-negative if and only if the denominator is strictly positive. Therefore, set the denominator x1>0x - 1 > 0. This strict inequality inherently prevents division by zero (x10x - 1 \neq 0). Solving x1>0x - 1 > 0 yields x>1x > 1. Thus, the domain consists of all real numbers strictly greater than 1, expressed in interval notation as (1, infty).

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Updated 2026-06-23

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