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What are the x-coordinates of the points where the graph of \(f(x)=x^2-4x\) intersects the x-axis?

Answer and explanation

Correct answer: x-coordinates: 0 and 4

At any point on the x-axis, the y-coordinate is 0. Hence, \(x^2-4x=0\), which factors as \(x(x-4)=0\). Therefore, \(x=0\) or \(x=4\), so option A is correct. Option B incorrectly includes \(-4\), which is not a zero of this function. Exam tip: To find the x-intercepts of a quadratic function, set \(f(x)=0\).

Related tags

Standard-FunctionsQuadratic-FunctionsX-InterceptsZerosGraphsGraphs Of Standard FunctionsRelations And FunctionsMathematics

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