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What is the range of f(x)=(x^2+1)/x?

Answer and explanation

Correct answer: (-∞,-2] ∪ [2,∞)

First rewrite the function as f(x)=x+1/x, with x≠0. To determine its range, let y=x+1/x. For x>0, the AM-GM inequality gives x+1/x≥2, with equality at x=1. Thus the positive branch has range [2,∞). For x<0, applying the corresponding inequality to −x shows x+1/x≤−2, with equality at x=−1. Thus the negative branch has range (-∞,−2]. Combining both branches gives (-∞,−2]∪[2,∞), option A. Values strictly between −2 and 2 cannot occur. Option B omits the negative branch, option C incorrectly excludes only zero, and option D lists precisely values that are not in the range.

Related tags

RangeRational-FunctionsInequalityReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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