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What is the range of the function \(f(x)=\sqrt{2x-x^2}\)?

Answer and explanation

Correct answer: [0,1]

Rewrite the radicand as \(2x-x^2=1-(x-1)^2\). For the square root to be defined, \(2x-x^2\ge 0\), giving the domain \([0,2]\). The radicand has maximum value \(1\) at \(x=1\), and minimum value \(0\) at \(x=0,2\). Therefore, the function values range from \(0\) to \(1\), so the range is \([0,1]\). Option B is incorrect because a square root cannot be negative, while option D wrongly excludes \(0\). Exam tip: For a square-root function, first find the minimum and maximum values of the radicand.

Related tags

Relations-FunctionsReal-Valued-FunctionsDomain-And-RangeRangeSquare-Root-FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And Functions

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