Math Problem Statement

Tentukanlah hasil dari lim x→2 (x^2 - x - 6) / (x + 2)

Solution

The problem asks to evaluate the limit:

limx2x2x6x+2\lim_{{x \to 2}} \frac{x^2 - x - 6}{x + 2}

Step-by-Step Solution:

  1. Factor the numerator:
    The expression in the numerator x2x6x^2 - x - 6 can be factored. We look for two numbers that multiply to 6-6 and add to 1-1. These numbers are 3-3 and 22. Hence, we can factor the numerator as:

    x2x6=(x3)(x+2)x^2 - x - 6 = (x - 3)(x + 2)

  2. Simplify the expression:
    Now the limit expression becomes:

    limx2(x3)(x+2)x+2\lim_{{x \to 2}} \frac{(x - 3)(x + 2)}{x + 2}

    Since x+2x + 2 appears in both the numerator and the denominator, they cancel out (as long as x2x \neq -2):

    limx2(x3)\lim_{{x \to 2}} (x - 3)

  3. Evaluate the limit:
    Now we can directly substitute x=2x = 2 into the simplified expression:

    23=12 - 3 = -1

Final Answer:

limx2x2x6x+2=1\lim_{{x \to 2}} \frac{x^2 - x - 6}{x + 2} = -1

Let me know if you need further clarifications or additional details!


Here are five related questions to enhance understanding:

  1. What would be the limit if xx approaches 2-2 in the same expression?
  2. How do you handle limits that result in indeterminate forms like 00\frac{0}{0}?
  3. What techniques can be used if factoring does not work for simplifying limits?
  4. How does L'Hôpital's Rule apply to this type of limit problem?
  5. What is the significance of removable discontinuities in the context of limits?

Tip: Always try factoring or simplifying expressions before using advanced limit techniques like L'Hôpital’s Rule!

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Math Problem Analysis

Mathematical Concepts

Limits
Factoring
Simplification of Rational Expressions

Formulas

Factorization of quadratic expressions: ax^2 + bx + c = (x + m)(x + n)

Theorems

Basic Limit Theorems
Removable Discontinuity

Suitable Grade Level

Grades 10-12