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What is the range of the function \\(f(x)=7-\\sqrt{(x-2)^2+9}\\)?

Answer and explanation

Correct answer: \\((-\\infty,4]\\)

Since \\((x-2)^2\\ge 0\\), we have \\(\\sqrt{(x-2)^2+9}\\ge 3\\). Therefore, \\(f(x)=7-\\sqrt{(x-2)^2+9}\\le 7-3=4\\). The maximum value 4 is attained at \\(x=2\\). As \\(|x|\\to\\infty\\), the square-root term tends to infinity, so \\(f(x)\\to-\\infty\\). Hence the range is \\((-\\infty,4]\\). Exam tip: first find the minimum of the radical expression; because it is subtracted, that minimum gives the maximum value of the function.

Related tags

Real-Valued-FunctionsRangeRadical-FunctionsMaximum-ValueDomain-And-RangeReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And Functions

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