Math Problem Statement

Реши е)

Реши е)

Solution

To solve the limit in part (e):

limx(5x2+8x25x2+3x+3)4x+1,\lim_{x \to \infty} \left( \frac{5x^2 + 8x - 2}{5x^2 + 3x + 3} \right)^{4x+1},

Step 1: Simplify the fraction

For large xx, the highest power of xx dominates in both the numerator and denominator. Therefore, divide the numerator and denominator by x2x^2:

5x2+8x25x2+3x+3=5+8x2x25+3x+3x2.\frac{5x^2 + 8x - 2}{5x^2 + 3x + 3} = \frac{5 + \frac{8}{x} - \frac{2}{x^2}}{5 + \frac{3}{x} + \frac{3}{x^2}}.

As xx \to \infty, the terms 8x,2x2,3x,3x2\frac{8}{x}, \frac{2}{x^2}, \frac{3}{x}, \frac{3}{x^2} approach 0. Thus, the fraction simplifies to:

5+005+0+0=1.\frac{5 + 0 - 0}{5 + 0 + 0} = 1.

Step 2: Apply the exponent

The limit now becomes:

limx(1)4x+1.\lim_{x \to \infty} \left( 1 \right)^{4x+1}.

Step 3: Evaluate the form

The expression 14x+11^{4x+1} equals 1 for all values of xx, so the limit is:

1.\boxed{1}.


Would you like me to explain any of the steps in more detail? 😊
Here are 5 related questions you might find helpful:

  1. How do you simplify limits of rational functions for large xx?
  2. What is the role of dominant terms in polynomial limits?
  3. How do you handle exponential expressions in limits?
  4. Can you explain L'Hôpital's Rule and when it applies?
  5. How do we evaluate limits involving indeterminate forms like 11^\infty?

Tip: When dealing with rational functions, always simplify by dividing through by the highest power of xx in the denominator!

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Math Problem Analysis

Mathematical Concepts

Limits
Rational Functions
Exponents

Formulas

Simplification of rational functions by dividing by the highest power of x
Evaluation of limits for expressions of the form 1^(infinity)

Theorems

Properties of limits
Dominance of leading terms in polynomials

Suitable Grade Level

Grades 11-12