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What is the correct option for (f:\mathbb{R}\to\mathbb{R}), (f(x)=e^x-x)?

Answer and explanation

Correct answer: It is not one-one

Step 1: (f'(x)=e^x-1), which is negative for (x<0) and positive for (x>0). Step 2: The function decreases first and then increases, so it is not one-one on all of (\mathbb{R}). Step 3: If a function changes direction, equal images may occur.

Related tags

One-One-FunctionDerivative-TestExponentialNon-InjectiveOne One FunctionRelations And FunctionsMathematicsClass 12 Mcq

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