Math Problem Statement

What is the simplified form and domain of the function f(x) = [(x - 4)^2 / (x^2 - 3x - 4)] - 2?

Solution

The function provided in the image is:

f(x)=(x4)2x23x42f(x) = \frac{(x - 4)^2}{x^2 - 3x - 4} - 2

Let me analyze it and provide the solution for its key properties:

Key Steps

  1. Factorize the denominator: x23x4x^2 - 3x - 4 can be written as (x4)(x+1)(x - 4)(x + 1).

  2. Simplify the function:

    • Rewrite f(x)f(x) as: f(x)=(x4)2(x4)(x+1)2f(x) = \frac{(x - 4)^2}{(x - 4)(x + 1)} - 2
    • For x4x \neq 4: f(x)=x4x+12f(x) = \frac{x - 4}{x + 1} - 2
  3. Combine terms under a common denominator: f(x)=x42(x+1)x+1f(x) = \frac{x - 4 - 2(x + 1)}{x + 1} Simplify the numerator: f(x)=x42x2x+1=x6x+1,x4,x1.f(x) = \frac{x - 4 - 2x - 2}{x + 1} = \frac{-x - 6}{x + 1}, \quad x \neq 4, \, x \neq -1.

  4. Final expression: f(x)=x6x+1,x4,x1.f(x) = \frac{-x - 6}{x + 1}, \quad x \neq 4, \, x \neq -1.

Domain:

  • The denominator x23x4=(x4)(x+1)0x^2 - 3x - 4 = (x - 4)(x + 1) \neq 0.
  • Exclude x=4x = 4 and x=1x = -1 from the domain.

Thus, the domain is: xR{1,4}.x \in \mathbb{R} \setminus \{-1, 4\}.

Additional Details:

Would you like me to:

  1. Analyze vertical and horizontal asymptotes?
  2. Plot the function for better visualization?
  3. Solve for critical points or intervals of increase/decrease?
  4. Find any local maxima/minima?
  5. Explore behavior near the excluded points?

Let me know if you have specific questions or need further clarification! One tip: Always simplify rational functions by factoring the numerator and denominator completely.

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Math Problem Analysis

Mathematical Concepts

Algebra
Rational Functions
Factoring

Formulas

(x - 4)^2
Denominator factorization: x^2 - 3x - 4 = (x - 4)(x + 1)
Simplification of rational expressions

Theorems

Domain exclusion for rational functions

Suitable Grade Level

Grades 10-12