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If (f:\mathbb{R}\to\mathbb{R}) is defined by (f(x)=x^3+x), what is the correct reason for (f) being one-one?

Answer and explanation

Correct answer: (f) is always increasing

Step 1: The value of (x^3+x) keeps increasing as (x) increases. Step 2: More formally, (f'(x)=3x^2+1>0), so the function is strictly increasing. Step 3: A strictly increasing function is one-one.

Related tags

FunctionsOne-OneIncreasingCubicRelations And FunctionsMathematicsClass 12 Mcq

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