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What is the range of the function \(f(x)=x^2+1\) defined over the real numbers?

Answer and explanation

Correct answer: \([1,\infty)\)

For every real \(x\), \(x^2\geq 0\). Hence \(f(x)=x^2+1\geq 1\). At \(x=0\), \(f(0)=1\), so 1 is the minimum value, and every larger value is possible. Thus, the range is \([1,\infty)\). Option B is wrong because the function can never have the value 0. Exam tip: find the minimum of \(x^2\), then include any constant vertical shift.

Related tags

Real Valued FunctionsRange Of FunctionsQuadratic FunctionDomain And RangeClass 11 MathematicsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And Functions

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