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What is the minimum value of the function \\(f(x)=x^2-4\\) when \\(x\in\mathbb{R}\\)?

Answer and explanation

Correct answer: -4

For every real number \\(x\\), \\(x^2\ge 0\\). Hence, \\(f(x)=x^2-4\ge -4\\), and equality occurs at \\(x=0\\), giving \\(f(0)=-4\\). Therefore, the minimum value is \\(-4\\). Exam tip: For a function of the form \\(x^2+c\\), the minimum value is \\(c\\) at \\(x=0\\).

Related tags

Quadratic-FunctionMinimum-ValueRangeReal-Valued-FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematics

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