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Which of the following real-valued functions has domain \(\mathbb{R}\) and range \([0,\infty)\)?

Answer and explanation

Correct answer: \(f(x)=x^2\)

Option \(f(x)=x^2\) is correct because \(x^2\geq0\) for every real \(x\), and it equals 0 at \(x=0\). In contrast, \(x^2+1\) has minimum value 1. Exam tip: find extrema to identify a function’s range.

Related tags

Relations And FunctionsReal Valued FunctionsDomain And RangeQuadratic FunctionClass 11 MathematicsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematics

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