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What are the x-coordinates of the x-intercepts of the function \(f(x)=3(x-1)^2-12\)?

Answer and explanation

Correct answer: \(x=-1\) and \(x=3\)

For an x-intercept, set \(f(x)=0\): \(3(x-1)^2-12=0\). Thus \((x-1)^2=4\), so \(x-1=\pm2\), giving \(x=-1\) and \(x=3\). Therefore, the intercept points are \((-1,0)\) and \((3,0)\). Option B includes \(x=1\), which is the x-coordinate of the vertex, not an x-intercept. Exam tip: To find x-intercepts, always set \(y=f(x)=0\).

Related tags

Standard-FunctionsQuadratic-FunctionsX-InterceptsGraphsGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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