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If (f:\mathbb{R}\setminus{1}\to\mathbb{R}\setminus{1}), (f(x)=\frac{x+1}{x-1}), choose the correct statement about (f).

Answer and explanation

Correct answer: It is onto

Step 1: Put (y=\frac{x+1}{x-1}). Step 2: Solving gives (x=\frac{y+1}{y-1}). This is defined when (y\ne 1), which is exactly the codomain condition. So every (y\in\mathbb{R}\setminus{1}) has a preimage. Step 3: For rational functions, solve for (x) in terms of (y).

Related tags

Relations-FunctionsRational-FunctionOnto-FunctionOnto FunctionRelations And FunctionsMathematicsClass 12 Mcq

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