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Which symmetry does the graph of \(f(x)=\frac{x^3}{x^2+1}\) have?

Answer and explanation

Correct answer: Symmetry about the origin

The domain is all real numbers because \(x^2+1\neq 0\). Also, \(f(-x)=\frac{(-x)^3}{(-x)^2+1}=-\frac{x^3}{x^2+1}=-f(x)\). Therefore, the function is odd, so its graph is symmetric about the origin. It is not symmetric about the y-axis, since that would require \(f(-x)=f(x)\). Exam tip: the condition \(f(-x)=-f(x)\) indicates symmetry about the origin.

Related tags

Graphs Of FunctionsRational FunctionsSymmetryOdd FunctionsGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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