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If (f:\mathbb{R}\to \mathbb{R}), (f(x)=x^3+a x), which condition surely makes (f) onto?

Answer and explanation

Correct answer: Every real (a)

Step 1: (x^3+a x) is an odd-degree polynomial. Step 2: Since the leading term is (x^3), the value goes to (\infty) as (x\to\infty) and to (-\infty) as (x\to-\infty). Step 3: A continuous odd-degree polynomial from (\mathbb{R}) to (\mathbb{R}) is onto.

Related tags

Relations And FunctionsOnto FunctionParameter CubicMathematicsClass 12 Mcq

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