Math Problem Statement

Evaluate the limit as x approaches infinity of (sqrt(x) + sqrt(x)) / sqrt(2x).

Solution

The problem involves evaluating the limit as xx \to \infty of the given expression:

limxx+x2x\lim_{x \to \infty} \frac{\sqrt{x} + \sqrt{x}}{\sqrt{2x}}

Let's simplify the expression step by step:

  1. Combine terms in the numerator: x+x=2x.\sqrt{x} + \sqrt{x} = 2\sqrt{x}.

    So the expression becomes: 2x2x.\frac{2\sqrt{x}}{\sqrt{2x}}.

  2. Simplify the fraction: 2x2x=2x2x.\frac{2\sqrt{x}}{\sqrt{2x}} = 2 \cdot \frac{\sqrt{x}}{\sqrt{2x}}.

  3. Simplify the square root ratio: x2x=x2x=12.\frac{\sqrt{x}}{\sqrt{2x}} = \frac{\sqrt{x}}{\sqrt{2} \cdot \sqrt{x}} = \frac{1}{\sqrt{2}}.

  4. Multiply: 212=22.2 \cdot \frac{1}{\sqrt{2}} = \frac{2}{\sqrt{2}}.

  5. Simplify further: 22=2.\frac{2}{\sqrt{2}} = \sqrt{2}.

Final Answer:

limxx+x2x=2.\lim_{x \to \infty} \frac{\sqrt{x} + \sqrt{x}}{\sqrt{2x}} = \sqrt{2}.

Let me know if you want additional clarification or have questions. Here are some related topics you might want to explore:

  1. How to evaluate other limits involving square roots and infinity?
  2. How to handle indeterminate forms in limits?
  3. The role of simplifying fractions in limit problems.
  4. Methods for rationalizing square root terms.
  5. Examples of limits at infinity in different contexts.

Tip: When dealing with limits involving square roots, factor out the dominant term for simplification.

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Math Problem Analysis

Mathematical Concepts

Limits
Simplification of Square Roots
Infinity in Calculus

Formulas

lim(x→∞) (f(x)) = L
√(a)/√(b) = √(a/b)
a + a = 2a

Theorems

Limit Properties
Simplification Techniques for Expressions

Suitable Grade Level

Grades 11-12