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If \(f(x)=\sqrt{x^2+4x+4}\), what is the range of \(f\)?

Answer and explanation

Correct answer: \([0,\infty)\)

Since \(x^2+4x+4=(x+2)^2\), we get \(f(x)=\sqrt{(x+2)^2}=|x+2|\). Its minimum value is \(0\), attained at \(x=-2\), and it can take every non-negative value thereafter. Therefore, the range is \([0,\infty)\). Option B is incorrect because it excludes \(0\). Exam tip: Rewrite the expression under the square root as a perfect square and identify its minimum value.

Related tags

RangeReal Valued FunctionsRadical FunctionsAbsolute ValueDomain And RangeTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And Functions

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