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At which \(x\)-values does the graph of \(y=|2x+6|-4\) intersect the \(x\)-axis?

Answer and explanation

Correct answer: \(x=-5,-1\)

On the \(x\)-axis, \(y=0\). Hence \(|2x+6|-4=0\), so \(|2x+6|=4\). This gives two cases: \(2x+6=4\), yielding \(x=-1\), and \(2x+6=-4\), yielding \(x=-5\). Therefore, the correct values are \(x=-5,-1\). Exam tip: for an equation \(|u|=a\), always consider both \(u=a\) and \(u=-a\). Option B does not result from correctly solving the two cases.

Related tags

GraphsModulus FunctionsX-InterceptsGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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