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Which statement is correct for the graph of y = √|x|?

Answer and explanation

Correct answer: It is symmetric about the y-axis

The governing idea is the test for even symmetry: a function is symmetric about the y-axis when f(−x) = f(x) for every x in its domain. Here f(x) = √|x|, so f(−x) = √|−x| = √|x| = f(x), because the absolute value removes the sign of x. Also, |x| is defined for every real x, so the domain is all real numbers, not only x ≥ 0. Since a square root is never negative, the range is [0, ∞), not (−∞, 0]. Thus the graph has two reflected branches on either side of the y-axis, making option A correct. Origin symmetry would require f(−x) = −f(x), which does not hold except at zero.

Related tags

GraphsSquare-RootAbsolute-ValueSymmetryGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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