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Which of the following points lies on the graph of the function \(f(x)=\sqrt{x}\)?

Answer and explanation

Correct answer: \((4,2)\)

A point \((x,y)\) lies on the graph when \(y=\sqrt{x}\). For \((4,2)\), \(\sqrt{4}=2\), so it satisfies the equation. In \((2,4)\), \(\sqrt{2}\neq4\); \((-4,2)\) is invalid because the square-root function is not defined for a negative real input; and \((4,-2)\) is impossible because the principal square root is non-negative. Exam tip: substitute the point’s \(x\)-coordinate into the function and compare the result with \(y\).

Related tags

Standard-FunctionsSquare-Root-FunctionGraph-PointsGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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