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If (f:\mathbb{R}\to\mathbb{R}), (f(x)=x^3-5x), what is a simple reason that (f) is onto?

Answer and explanation

Correct answer: The polynomial is continuous and goes unbounded in both directions

Step 1: (x^3-5x) is a continuous cubic polynomial. Step 2: As (x\to\infty), it goes to (\infty), and as (x\to-\infty), it goes to (-\infty). Step 3: Such a cubic polynomial takes all real values.

Related tags

Cubic PolynomialOntoContinuityReal RangeOnto FunctionRelations And FunctionsMathematicsClass 12 Mcq

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