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If (f:\mathbb{R}\to[1,\infty)), (f(x)=|x-4|+1), which statement is correct about (f)?

Answer and explanation

Correct answer: Onto but not one-one

Step 1: (|x-4|\ge 0), so (f(x)\ge 1). Step 2: For every (y\ge 1), the equation (|x-4|=y-1) has a solution, so the function is onto. But (x=3) and (x=5) give the same value. Step 3: A modulus function can be onto but often not one-one.

Related tags

Relations-FunctionsModulus-RangeOnto-FunctionOnto FunctionRelations And FunctionsMathematicsClass 12 Mcq

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