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If (f(x)=\sqrt{x-2}) and (g(x)=x-5), what is the domain of (\frac{f}{g})?

Answer and explanation

Correct answer: ( [2,\infty)-{5} )

The quotient \\(\\frac{f}{g}\\) is formed by dividing \\(f(x)=\\sqrt{x-2}\\) by \\(g(x)=x-5\\). Its domain must satisfy two independent conditions: the radicand of the square root cannot be negative, and the denominator cannot be zero. Both restrictions must hold at the same time.

From \\(x-2\\ge0\\), we get \\(x\\ge2\\). From the denominator, \\(x-5\\ne0\\), so \\(x\\ne5\\). Combining these gives \\([2,\\infty)\\setminus\\{5\\}\\). The endpoint 2 is included because \\(\\sqrt{0}\\) is defined, while 5 is excluded because division by zero is impossible. Therefore option A is correct.

Related tags

Relations-FunctionsQuotient-DomainRadical

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