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What is the minimum value of the function \(y=|x^2-9|\), where \(x\in\mathbb{R}\)?

Answer and explanation

Correct answer: 0

The modulus of any real number is non-negative, so \(y=|x^2-9|\) cannot be less than \(0\). This value is attained when \(x^2-9=0\), giving \(x=\pm3\). Hence, the correct answer is A. Exam tip: For a modulus function, first check whether the expression inside the modulus can equal zero; if it can, the minimum value is \(0\).

Related tags

Relations And FunctionsStandard FunctionsModulus FunctionQuadratic FunctionsMinimum ValueGraphs Of Standard FunctionsMathematicsClass 11 Mcq

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