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If (f:\mathbb{R}\to[0,\infty)) and (f(x)=|x|), which statement is correct?

Answer and explanation

Correct answer: Onto but not one-one

Step 1: (f(2)=2) and (f(-2)=2), so the function is not one-one. Step 2: Every value (y\geq0) in the codomain is obtained by taking (x=y). Step 3: In modulus functions, opposite signs can give the same output.

Related tags

FunctionsModulusOntoNot-One-OneRelations And FunctionsMathematicsClass 12 Mcq

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