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At which \(x\)-values does the graph of the function \(y=2|x|-6\) intersect the \(x\)-axis?

Answer and explanation

Correct answer: \(x=-3\) and \(x=3\)

A point on the \(x\)-axis has \(y=0\). Hence, \(2|x|-6=0\), giving \(|x|=3\), so \(x=-3\) or \(x=3\). Therefore, option A is correct. In option C, \(x=0\) gives the vertex \((0,-6)\), which is not on the \(x\)-axis. Exam tip: when \(|x|=a\) with \(a>0\), consider both values \(x=\pm a\).

Related tags

GraphsModulus FunctionsX-InterceptsStandard FunctionsGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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