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Which of the following functions has a graph symmetric about the y-axis?

Answer and explanation

Correct answer: \(f(x)=|x|\)

For \(f(x)=|x|\), we get \(f(-x)=|-x|=|x|=f(x)\). Hence, it is an even function and its graph is symmetric about the y-axis. The functions \(x\), \(x^3\), and \(\frac{1}{x}\) are odd functions, so their graphs are symmetric about the origin, not the y-axis. Exam tip: To test y-axis symmetry, check whether \(f(-x)=f(x)\).

Related tags

Relations And FunctionsStandard Function GraphsEven FunctionsGraph SymmetryClass 11 MathematicsGraphs Of Standard FunctionsMathematicsClass 11 Mcq

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