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If (f:\mathbb{R}\to\mathbb{R}), (f(x)=x^3+x^2+x), is (f) onto?

Answer and explanation

Correct answer: Yes, because its range is (\mathbb{R})

Step 1: This is a continuous polynomial with an odd leading degree. Step 2: As (x\to\infty), the value goes to (\infty), and as (x\to-\infty), it goes to (-\infty). Hence it takes every real value in between and is onto. Step 3: Use the end behavior of continuous cubic polynomials to judge onto nature.

Related tags

Relations-FunctionsPolynomial-OntoIntermediate-ValuesOnto FunctionRelations And FunctionsMathematicsClass 12 Mcq

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