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What type of symmetry does the graph of the function \(f(x)=\frac{x^2-1}{x^2+1}\) have?

Answer and explanation

Correct answer: Symmetry about the y-axis

For this function, \(f(-x)=\frac{(-x)^2-1}{(-x)^2+1}=\frac{x^2-1}{x^2+1}=f(x)\). Hence, the function is even, so its graph is symmetric about the y-axis. Symmetry about the origin would require \(f(-x)=-f(x)\), which does not hold here. Exam tip: use \(f(-x)=f(x)\) for y-axis symmetry and \(f(-x)=-f(x)\) for origin symmetry.

Related tags

GraphsRational FunctionsSymmetryEven FunctionsRelations And FunctionsGraphs Of Standard FunctionsMathematicsClass 11 Mcq

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