Math Problem Statement

Find the limit

Find the limit: lim (x -> ∞) of (4x^2) / (3x^3 - x^2 + 2)

Solution

The given limit is:

limx4x23x3x2+2\lim_{x \to \infty} \frac{4x^2}{3x^3 - x^2 + 2}

Step-by-Step Solution:

  1. Identify the degrees of the polynomial in the numerator and the denominator:

    • The highest degree term in the numerator is 4x24x^2, so the degree of the numerator is 2.
    • The highest degree term in the denominator is 3x33x^3, so the degree of the denominator is 3.
  2. Divide both the numerator and denominator by the highest power of xx, which is x3x^3, since the degree of the denominator is 3:

    4x2x33x3x3x2x3+2x3=4x31x+2x3\frac{\frac{4x^2}{x^3}}{\frac{3x^3}{x^3} - \frac{x^2}{x^3} + \frac{2}{x^3}} = \frac{\frac{4}{x}}{3 - \frac{1}{x} + \frac{2}{x^3}}

  3. Simplify the expression as xx \to \infty:

    • As xx \to \infty, 4x0\frac{4}{x} \to 0, 1x0\frac{1}{x} \to 0, and 2x30\frac{2}{x^3} \to 0.
    • The expression simplifies to: 030+0=03=0\frac{0}{3 - 0 + 0} = \frac{0}{3} = 0

Thus, the limit is:

limx4x23x3x2+2=0\lim_{x \to \infty} \frac{4x^2}{3x^3 - x^2 + 2} = 0

Would you like more details, or do you have any questions?


Here are five related questions to further your understanding:

  1. How would the result change if the degree of the numerator was higher than the denominator?
  2. What happens if you approach xx \to -\infty instead of xx \to \infty?
  3. How do we compute limits when both numerator and denominator have the same degree?
  4. Can L'Hôpital's rule be applied to this limit? How would it work?
  5. How do we handle limits involving exponential or logarithmic functions?

Tip: When the degrees of the polynomials in the numerator and denominator differ, the result is often determined by the degree of the highest power of xx.

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Math Problem Analysis

Mathematical Concepts

Limits
Polynomial Division
Degree of Polynomials

Formulas

lim (x -> ∞)
Polynomial Division by the highest degree term

Theorems

Limit of a rational function as x approaches infinity

Suitable Grade Level

College Calculus