Math Problem Statement

Solution

The problem asks for the limit as xx approaches infinity of the function x3+x2+1x3\sqrt[3]{x^3 + x^2 + 1 - x}.

Let's analyze the expression inside the cube root:

f(x)=x3+x2+1x3f(x) = \sqrt[3]{x^3 + x^2 + 1 - x}

Step 1: Simplify the expression inside the cube root

The dominant term inside the cube root as xx approaches infinity is x3x^3, because it's the highest degree term. Therefore, we can factor x3x^3 out of the expression inside the cube root:

f(x)=x3(1+1x+1x21x2)3f(x) = \sqrt[3]{x^3(1 + \frac{1}{x} + \frac{1}{x^2} - \frac{1}{x^2})}

Simplifying the expression inside the cube root:

f(x)=x3(1+x2+1xx3)3f(x) = \sqrt[3]{x^3 \left(1 + \frac{x^2 + 1 - x}{x^3}\right)}

As xx approaches infinity, the fraction terms 1x\frac{1}{x}, 1x2\frac{1}{x^2}, and 1x3\frac{1}{x^3} approach zero:

[ f(x) = \sqrt[3]{x^3 \cdot 1} = \sqrt[3]{x^3} = x ]

Step 2: Evaluate the limit

As xx approaches infinity:

limxf(x)=limxx=\lim_{x \to \infty} f(x) = \lim_{x \to \infty} x = \infty

Therefore, the limit of the given function as xx approaches infinity is \infty.

Would you like a more detailed explanation, or do you have any questions? Here are some related questions you might find interesting:

  1. How do you evaluate limits at infinity involving polynomial expressions?
  2. What happens to functions involving roots as xx approaches infinity?
  3. How do you determine the dominant term in a polynomial?
  4. Can limits at infinity ever result in a finite number?
  5. How does L'Hôpital's Rule apply to limits involving infinity?

Tip: When finding limits involving infinity, focusing on the highest-degree term can often simplify the problem significantly.

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Math Problem Analysis

Mathematical Concepts

Limits
Infinity
Polynomial Functions

Formulas

Limit definition
Asymptotic behavior of functions

Theorems

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Suitable Grade Level

Advanced High School