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Which of the following functions has all real numbers as its domain?

Answer and explanation

Correct answer: \(f(x)=x^2+4\)

For \(f(x)=x^2+4\), every real value of \(x\) gives a defined output, so its domain is \(\mathbb{R}\). In option B, \(x=-2\) is excluded. Exam tip: for square-root functions, the expression inside the root must be \(\geq 0\).

Related tags

Real Valued FunctionsDomainRelations And FunctionsQuadratic FunctionClass 11 MathematicsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematics

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