Math Problem Statement

List the domain and the x- and y-intercepts of the function f(x) = (x - 3) / (x + 5). Graph the function. Be sure to label all the asymptotes.

Solution

The given function is:

f(x)=x3x+5f(x) = \frac{x - 3}{x + 5}

Let's go through the steps to solve the problem:

1. Domain:

The domain consists of all real numbers except where the denominator equals zero (since division by zero is undefined).

Set the denominator equal to zero and solve: x+5=0    x=5x + 5 = 0 \implies x = -5

So, the domain is: (,5)(5,)(-\infty, -5) \cup (-5, \infty)

2. X-intercept:

The x-intercept occurs when f(x)=0f(x) = 0, which means the numerator of the function equals zero.

Set x3=0x - 3 = 0 and solve: x=3x = 3

Thus, the x-intercept is at (3,0)(3, 0).

3. Y-intercept:

The y-intercept occurs when x=0x = 0.

Substitute x=0x = 0 into the function: f(0)=030+5=35f(0) = \frac{0 - 3}{0 + 5} = \frac{-3}{5}

Thus, the y-intercept is at (0,35)\left(0, -\frac{3}{5}\right).

4. Asymptotes:

  • Vertical Asymptote: The vertical asymptote occurs where the denominator equals zero, which we've already found to be at x=5x = -5.

  • Horizontal Asymptote:

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Math Problem Analysis

Mathematical Concepts

Rational Functions
Domain and Range
Intercepts
Asymptotes

Formulas

X-intercept: Set numerator = 0
Y-intercept: Evaluate f(0)
Vertical asymptote: Set denominator = 0
Horizontal asymptote: Compare degrees of numerator and denominator

Theorems

Properties of Rational Functions

Suitable Grade Level

Grades 9-12