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At which \(x\)-value is the vertex of the graph of \(f(x)=|3x-9|\)?

Answer and explanation

Correct answer: \(x=3\)

For a modulus function \(f(x)=|ax+b|\), the vertex occurs where the expression inside the modulus is zero. Thus, \(3x-9=0\), giving \(x=3\), and the vertex is \((3,0)\). The choice \(x=9\) results from confusing the constant term with the required value of \(x\). Exam tip: Set the linear expression inside the modulus equal to zero to find the vertex's \(x\)-coordinate.

Related tags

Standard-FunctionsModulus-GraphVertexAbsolute-ValueLinear-ExpressionGraphs Of Standard FunctionsRelations And FunctionsMathematics

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