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For the function \(f(x)=|x-4|\), at which value of \(x\) is the minimum value attained?

Answer and explanation

Correct answer: \(x=4\)

The expression \(|x-4|\) is smallest when the quantity inside the modulus is zero: \(x-4=0\). Thus, \(x=4\), and the minimum value of the function is \(0\). For instance, at \(x=1\), the value is \(3\), so it is not the minimum. Exam tip: \(|x-a|\) attains its minimum value, \(0\), at \(x=a\).

Related tags

Standard-FunctionsModulus-FunctionMinimum-ValueGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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