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

Answer and explanation

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

At an intersection, both functions have the same \(y\)-value, so set \(x^2=2x+3\). This gives \(x^2-2x-3=0\), or \((x-3)(x+1)=0\). Hence \(x=3\) or \(x=-1\), making option A correct. Exam tip: To find intersection coordinates, first equate the two function expressions and solve for \(x\).

Related tags

GraphsIntersectionQuadratic FunctionsGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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