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If (f:(0,\infty)\to\mathbb{R}) is defined by (f(x)=\ln x), what type of function is (f)?

Answer and explanation

Correct answer: Bijective

Step 1: (\ln x) is strictly increasing on ((0,\infty)). Step 2: For every real (y), choosing (x=e^y>0) gives (\ln x=y). Step 3: Hence it is bijective from ((0,\infty)) to (\mathbb{R}).

Related tags

Logarithmic FunctionBijectionInverseFunctionsRelations And FunctionsMathematicsClass 12 Mcq

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