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If the domain of \(f(x)=\sqrt{x}\) is \([0,9]\), what is its range?

Answer and explanation

Correct answer: \([0,3]\)

For \(x\in[0,9]\), the minimum value of \(\sqrt{x}\) is \(\sqrt{0}=0\), and the maximum value is \(\sqrt{9}=3\). Therefore, the range is \([0,3]\). Option B is the domain of \(x\), not the range of \(f(x)\). Exam tip: For a square-root function on a closed interval, evaluate the function at the interval's endpoints to find the range.

Related tags

RangeDomainSquare-Root FunctionReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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