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What is the maximum value of the function \(f(x)=-|x-1|+4\)?

Answer and explanation

Correct answer: 4

Since \(|x-1|\ge 0\), we have \(-|x-1|\le 0\), so \(f(x)=-|x-1|+4\le 4\). At \(x=1\), \(|x-1|=0\) and \(f(1)=4\); hence the maximum value is 4. Option 1 may result from confusing the \(x\)-value at which the maximum occurs with the function's maximum value. Exam tip: a negative coefficient of the modulus gives an inverted V-shaped graph, whose vertex represents the maximum.

Related tags

Standard-FunctionsModulus-FunctionsMaximum-ValueGraphs-Of-FunctionsGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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