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What are the x-coordinates of the points where the graph of \(f(x)=x^2-9\) intersects the x-axis?

Answer and explanation

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

At an x-intercept, the y-coordinate is 0. Thus, set \(f(x)=0\): \(x^2-9=0\), which factors as \((x-3)(x+3)=0\). Hence \(x=3\) or \(x=-3\), so option B is correct. The complete intercept points are \((3,0)\) and \((-3,0)\). Exam tip: for x-intercepts, always substitute \(y=0\) or set \(f(x)=0\).

Related tags

Standard-FunctionsQuadratic-FunctionX-InterceptsGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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