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At which values of \(x\) do the graphs of \(y=x^2\) and \(y=3x+4\) intersect?

Answer and explanation

Correct answer: \(x\in\{-1,4\}\)

At an intersection point, both graphs have the same \(y\)-value, so set \(x^2=3x+4\). Rearranging and factoring gives \(x^2-3x-4=0\), or \((x-4)(x+1)=0\). Hence \(x=4\) or \(x=-1\), making option A correct. Option B results from taking the sign of the root \(-1\) incorrectly. Exam tip: to find intersections of two graphs, equate their \(y\)-expressions first.

Related tags

GraphsIntersectionQuadratic EquationsRelations And FunctionsStandard FunctionsGraphs Of Standard FunctionsMathematicsClass 11 Mcq

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