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

Answer and explanation

Correct answer: It is continuous and as (x\to\pm\infty), values go to (\pm\infty)

Step 1: (x^3+x) is continuous on all real numbers. Step 2: For very large positive (x), values become very large positive, and for very large negative (x), values become very large negative. Step 3: Continuity with unbounded behavior on both sides ensures every real value is obtained.

Related tags

Onto FunctionCubicContinuityReal NumbersRelations And FunctionsMathematicsClass 12 Mcq

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