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At which \(x\)-values does the graph of the function \(y=3|x+2|-9\) intersect the \(x\)-axis?

Answer and explanation

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

Every point on the \(x\)-axis has \(y=0\). Hence, \(3|x+2|-9=0\), which gives \(|x+2|=3\). Taking both cases, \(x+2=3\) gives \(x=1\), while \(x+2=-3\) gives \(x=-5\). Therefore, the intercepts occur at \(x=-5\) and \(x=1\). Option B does not result from solving the modulus equation correctly. Exam tip: for \(|u|=a\) with \(a>0\), always consider both equations \(u=a\) and \(u=-a\).

Related tags

GraphsModulus EquationsX-InterceptsAbsolute ValueGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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