Math Problem Statement

W1. lim

xS2

2x

2

-11x +14

x

2

-5x +6

Solution

It seems you're asking to find the limit of the following rational function as x2x \to 2:

limx22x211x+14x25x+6\lim_{x \to 2} \frac{2x^2 - 11x + 14}{x^2 - 5x + 6}

Let's break it down and solve step by step:

Step 1: Factorize the numerator and denominator

  1. Numerator: The numerator is 2x211x+142x^2 - 11x + 14. Let's factorize it:

    • Multiply the leading coefficient (2) by the constant (14) to get 2×14=282 \times 14 = 28.
    • We need two numbers that multiply to 28 and add to -11. These numbers are -7 and -4.

    So, the factorization of the numerator is: 2x211x+14=(2x7)(x2)2x^2 - 11x + 14 = (2x - 7)(x - 2)

  2. Denominator: The denominator is x25x+6x^2 - 5x + 6. Factorizing this quadratic:

    • We need two numbers that multiply to 6 and add to -5. These numbers are -3 and -2.

    So, the factorization of the denominator is: x25x+6=(x2)(x3)x^2 - 5x + 6 = (x - 2)(x - 3)

Step 2: Simplify the expression

Now that we have the factored form of both the numerator and denominator, the expression becomes: (2x7)(x2)(x2)(x3)\frac{(2x - 7)(x - 2)}{(x - 2)(x - 3)}

Cancel out the common factor (x2)(x - 2) from the numerator and denominator: 2x7x3\frac{2x - 7}{x - 3}

Step 3: Substitute x=2x = 2 into the simplified expression

Now, substitute x=2x = 2 into the simplified expression: 2(2)723=4723=31=3\frac{2(2) - 7}{2 - 3} = \frac{4 - 7}{2 - 3} = \frac{-3}{-1} = 3

Final Answer:

limx22x211x+14x25x+6=3\lim_{x \to 2} \frac{2x^2 - 11x + 14}{x^2 - 5x + 6} = 3

Let me know if you would like more details or have any questions!


Here are 5 related questions you could explore:

  1. How do you find limits when direct substitution results in an indeterminate form?
  2. What is the difference between removable and non-removable discontinuities in a function?
  3. Can you factor a higher-degree polynomial in a similar way?
  4. How does the behavior of a function near a limit differ from its behavior at the limit?
  5. What techniques can be used if a rational function can't be factored easily?

Tip: Always check if a limit leads to an indeterminate form, like 00\frac{0}{0}, before applying algebraic simplifications.

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Math Problem Analysis

Mathematical Concepts

Limits
Algebra
Factoring Quadratics
Rational Functions

Formulas

Limit of a rational function as x approaches a value
Factoring quadratic equations: ax^2 + bx + c

Theorems

Limit Laws
Factoring Quadratic Theorem

Suitable Grade Level

Grades 10-12