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 10 negative 9 6 8 9 f left parenthesis x right parenthesis equals StartFraction x minus 7 Over x squared minus 49 EndFraction enter your response here enter your response here enter your response here enter your response here enter your response here

Solution

Let’s solve this step-by-step. We are working with the function:

f(x)=x7x249f(x) = \frac{x - 7}{x^2 - 49}

First, we’ll simplify and analyze the function, identify the intercepts and asymptotes, and find the function values at the given points: x=10,9,6,8,x = -10, -9, 6, 8, and 99.


Step 1: Simplify the function

The denominator x249x^2 - 49 can be factored:

x249=(x7)(x+7)x^2 - 49 = (x - 7)(x + 7)

Thus, the function becomes:

f(x)=x7(x7)(x+7)f(x) = \frac{x - 7}{(x - 7)(x + 7)}

For all x7x \neq 7, we can cancel the factor x7x - 7, giving:

f(x)=1x+7,for x7.f(x) = \frac{1}{x + 7}, \quad \text{for } x \neq 7.

Step 2: Identify key features

  • Vertical asymptote: The vertical asymptote occurs when the denominator is 0. That happens when x+7=0x + 7 = 0, i.e., at:

    x=7.x = -7.

  • Hole in the graph: There's a removable discontinuity (hole) at x=7x = 7, where the factor x7x - 7 was canceled out.

  • x-intercept: Set the numerator 1=01 = 0. However, this is impossible, so there are no x-intercepts.

  • y-intercept: Evaluate f(0)f(0).

    f(0)=10+7=17.f(0) = \frac{1}{0 + 7} = \frac{1}{7}.


Step 3: Evaluate the function at the given points

  1. At x=10x = -10:

    f(10)=110+7=13=13.f(-10) = \frac{1}{-10 + 7} = \frac{1}{-3} = -\frac{1}{3}.

  2. At x=9x = -9:

    f(9)=19+7=12=12.f(-9) = \frac{1}{-9 + 7} = \frac{1}{-2} = -\frac{1}{2}.

  3. At x=6x = 6:

    f(6)=16+7=113.f(6) = \frac{1}{6 + 7} = \frac{1}{13}.

  4. At x=8x = 8:

    f(8)=18+7=115.f(8) = \frac{1}{8 + 7} = \frac{1}{15}.

  5. At x=9x = 9:

    f(9)=19+7=116.f(9) = \frac{1}{9 + 7} = \frac{1}{16}.


Final Answer:

  • f(10)=13f(-10) = -\frac{1}{3}
  • f(9)=12f(-9) = -\frac{1}{2}
  • f(6)=113f(6) = \frac{1}{13}
  • f(8)=115f(8) = \frac{1}{15}
  • f(9)=116f(9) = \frac{1}{16}

Would you like further clarification or a graph of this function to visualize it?


Related Questions:

  1. What happens to f(x)f(x) as x7+x \to -7^+ and x7x \to -7^-?
  2. What are horizontal asymptotes, if any, of the function?
  3. How do you determine if a discontinuity is removable or non-removable?
  4. What is the behavior of the function as xx \to \infty?
  5. How would the function change if we modified the numerator?

Tip: Always factor the denominator when analyzing rational functions—it simplifies detecting asymptotes and holes.

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Math Problem Analysis

Mathematical Concepts

Rational Functions
Asymptotes
Intercepts
Limits

Formulas

Factorization of difference of squares: a^2 - b^2 = (a - b)(a + b)
Simplification of rational functions

Theorems

Rational Function Asymptote Theorem
Limit Definition of Asymptotes

Suitable Grade Level

Grades 10-12