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If (f:\mathbb{R}\to\mathbb{R}), (f(x)=ax^3+bx+c), (a>0) and (b>0), what is the correct statement about (f)?

Answer and explanation

Correct answer: It is one-one

Step 1: (f'(x)=3ax^2+b). Step 2: Since (a>0) and (b>0), (3ax^2+b>0) for every real (x). Step 3: If the derivative is always positive, the function is strictly increasing and one-one.

Related tags

Parametric CubicDerivativeOne-OneStrictly IncreasingOne One FunctionRelations And FunctionsMathematicsClass 12 Mcq

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