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What is the domain of \(f(x)=\sqrt{x-4}+1\)?

Answer and explanation

Correct answer: \(x\ge 4\)

For a real-valued function, the expression under the square root cannot be negative. Thus, \(x-4\ge 0\), which gives \(x\ge 4\). Therefore, the domain is \([4,\infty)\). Option B reverses the inequality, while option D incorrectly includes values that make the radicand negative. Exam tip: For a square-root function, set the radicand greater than or equal to zero to find the domain.

Related tags

Relations-And-FunctionsStandard-FunctionsSquare-Root-FunctionDomainGraphsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And Functions

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