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At which value of \(x\) do the graphs \(y=\sqrt{x+1}\) and \(y=3\) intersect?

Answer and explanation

Correct answer: \(x=8\)

At the intersection, the two graphs have the same \(y\)-value, so \(\sqrt{x+1}=3\). Squaring both sides gives \(x+1=9\), hence \(x=8\). The distractor \(x=9\) results from forgetting to subtract 1. Exam tip: Always substitute the obtained value back into the original equation; here, \(\sqrt{8+1}=3\).

Related tags

GraphsIntersectionStandard FunctionsSquare RootGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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