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If f: ℝ → ℝ is defined by f(x) = |x|, which statement is correct?

Answer and explanation

Correct answer: It is a function because every x has exactly one image

A function must assign exactly one output to every input in its domain. For every real number x, |x| is a uniquely determined non-negative real number, so f: ℝ → ℝ is indeed a function. It is not required that different inputs have different outputs; that stronger property is injectivity. Since f(2) = f(−2) only shows that the function is not one-one, option A is correct.

Related tags

FunctionsAbsolute ValueOne-One FunctionRelations And Functions

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