Math Problem Statement

Plot points between and beyond each​ x-intercept and vertical asymptote. Find the value of the function at the given value of x. x

negative 6 negative 5 2 4 5 f left parenthesis x right parenthesis equals StartFraction x minus 3 Over x squared minus 9 EndFraction enter your response here enter your response here enter your response here enter your response here enter your response here ​(Simplify your​ answers.)

Solution

To solve this, let's examine the function and its characteristics step-by-step.

The function given is: f(x)=x3x29f(x) = \frac{x - 3}{x^2 - 9}

Step 1: Find the x-intercepts and vertical asymptotes

  1. Factor the denominator: x29=(x+3)(x3)x^2 - 9 = (x + 3)(x - 3)

    This means the function simplifies to: f(x)=x3(x+3)(x3)f(x) = \frac{x - 3}{(x + 3)(x - 3)}

    Since x3x - 3 cancels out, the function becomes: f(x)=1x+3for x3f(x) = \frac{1}{x + 3} \quad \text{for } x \neq 3

  2. Identify the vertical asymptote:

    • The denominator x+3=0x + 3 = 0 when x=3x = -3, so there is a vertical asymptote at x=3x = -3.
  3. Find the x-intercepts:

    • Since x3x - 3 canceled out, there are no x-intercepts for this function.

Step 2: Evaluate the function at given x-values

Now that we have simplified the function to f(x)=1x+3f(x) = \frac{1}{x + 3}, let’s evaluate it at each requested value of xx:

  1. At x=6x = -6: f(6)=16+3=13=13f(-6) = \frac{1}{-6 + 3} = \frac{1}{-3} = -\frac{1}{3}

  2. At x=5x = -5: f(5)=15+3=12=12f(-5) = \frac{1}{-5 + 3} = \frac{1}{-2} = -\frac{1}{2}

  3. At x=2x = 2: f(2)=12+3=15f(2) = \frac{1}{2 + 3} = \frac{1}{5}

  4. At x=4x = 4: f(4)=14+3=17f(4) = \frac{1}{4 + 3} = \frac{1}{7}

  5. At x=5x = 5: f(5)=15+3=18f(5) = \frac{1}{5 + 3} = \frac{1}{8}

Summary of values

The values of f(x)f(x) at the given points are:

  • f(6)=13f(-6) = -\frac{1}{3}
  • f(5)=12f(-5) = -\frac{1}{2}
  • f(2)=15f(2) = \frac{1}{5}
  • f(4)=17f(4) = \frac{1}{7}
  • f(5)=18f(5) = \frac{1}{8}

Would you like a graph of this function or further explanation on any part of the solution?

Further Questions to Consider

  1. What happens to the function as xx approaches the vertical asymptote at x=3x = -3?
  2. How does the function behave as xx \to \infty or xx \to -\infty?
  3. Are there any horizontal asymptotes in this function?
  4. How would additional transformations, such as shifting or reflecting, affect the function's graph?
  5. What would be the result if the function were redefined to avoid canceling x3x - 3?

Tip

Remember, vertical asymptotes occur where the function's denominator equals zero, resulting in undefined values for f(x)f(x) at those points.

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Math Problem Analysis

Mathematical Concepts

Rational Functions
Vertical Asymptotes
Simplification of Expressions
Function Evaluation

Formulas

f(x) = (x - 3) / (x^2 - 9)

Theorems

Vertical Asymptote Identification
Factorization of Quadratic Expressions

Suitable Grade Level

Grades 10-12