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If \(f(x)=|x-4|\), what possible values of \(x\) satisfy \(f(x)=6\)?

Answer and explanation

Correct answer: \(\{-2,10\}\)

Substituting \(f(x)=6\) gives \(|x-4|=6\). A modulus equation has two cases: \(x-4=6\), giving \(x=10\), and \(x-4=-6\), giving \(x=-2\). Hence the correct set is \(\{-2,10\}\). In option B, \(x=2\) gives \(|2-4|=2\), not 6. Exam tip: for \(|A|=k\) with \(k>0\), always solve both \(A=k\) and \(A=-k\).

Related tags

Real-Valued-FunctionsModulus-EquationsDomain-And-RangeAbsolute-ValueRelations-And-FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And Functions

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