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What are the zeros of the function \(f(x)=|x^2-4|\), that is, the values of \(x\) for which \(f(x)=0\)?

Answer and explanation

Correct answer: \(x=2\) and \(x=-2\)

The modulus of a quantity is zero only when the quantity itself is zero. Thus, \(|x^2-4|=0\) requires \(x^2-4=0\), or \(x^2=4\), giving \(x=2\) or \(x=-2\). Option B incorrectly uses 4 and -4, which would correspond to \(x^2=16\). Exam tip: The zeros of \(|g(x)|\) are exactly the zeros of \(g(x)\).

Related tags

Standard-FunctionsModulus-FunctionZerosQuadratic-EquationsGraphsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And Functions

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