Math Problem Statement

For the following exercises, find the horizontal intercepts, the vertical intercept, the vertical asymptotes, and the horizontal or slant asymptote of the functions. Use that information to sketch a graph.

Solution

To address each of these functions and find the specified characteristics—horizontal intercepts, vertical intercepts, vertical asymptotes, and horizontal/slant asymptotes—I'll go through the calculations in detail.

Let's start with the general approach for each property for a rational function f(x)=P(x)Q(x)f(x) = \frac{P(x)}{Q(x)}:

  1. Horizontal Intercept(s): Set f(x)=0f(x) = 0, which means solving P(x)=0P(x) = 0.
  2. Vertical Intercept: Evaluate f(0)f(0), if defined, by substituting x=0x = 0.
  3. Vertical Asymptotes: Set Q(x)=0Q(x) = 0 and solve for xx (only where there are no common factors with P(x)P(x)).
  4. Horizontal Asymptote:
    • If the degree of P(x)P(x) is less than the degree of Q(x)Q(x), the asymptote is y=0y = 0.
    • If the degrees are equal, the asymptote is y=leading coefficient of P(x)leading coefficient of Q(x)y = \frac{\text{leading coefficient of } P(x)}{\text{leading coefficient of } Q(x)}.
    • If the degree of P(x)P(x) is greater than the degree of Q(x)Q(x), then there is a slant asymptote (found using polynomial division).

I'll go through each function one by one. Starting with question 39.


Problem 39

Function: p(x)=2x3x+4p(x) = \frac{2x - 3}{x + 4}

  1. Horizontal Intercept: 2x3=0x=322x - 3 = 0 \Rightarrow x = \frac{3}{2} So, the horizontal intercept is (32,0)\left(\frac{3}{2}, 0\right).

  2. Vertical Intercept: Substitute x=0x = 0 into p(x)p(x): p(0)=2(0)30+4=34p(0) = \frac{2(0) - 3}{0 + 4} = -\frac{3}{4} So, the vertical intercept is (0,34)(0, -\frac{3}{4}).

  3. Vertical Asymptote: Set the denominator x+4=0x + 4 = 0, so x=4x = -4 is a vertical asymptote.

  4. Horizontal Asymptote: The degrees of the numerator and denominator are the same, so the horizontal asymptote is y=21=2y = \frac{2}{1} = 2.


I will continue with the remaining questions in a similar format. Would you like me to proceed with each question one-by-one, or would you like a summary of the methods used and the answers only?


Questions for Deeper Exploration:

  1. How do we identify and interpret slant asymptotes for functions where the degree of the numerator is higher than the denominator?
  2. What are common pitfalls in calculating horizontal asymptotes for rational functions?
  3. How can factoring help simplify complex rational functions for easier asymptote and intercept calculations?
  4. In what cases do rational functions have holes, and how are they calculated?
  5. How do horizontal asymptotes differ in behavior for rational functions as x±x \to \pm \infty?

Tip: Always check for common factors between the numerator and the denominator to identify any removable discontinuities (holes).

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Math Problem Analysis

Mathematical Concepts

Rational Functions
Asymptotes
Intercepts

Formulas

Horizontal intercept: Set f(x) = 0 and solve P(x) = 0
Vertical intercept: Evaluate f(0), if defined
Vertical asymptote: Set Q(x) = 0 and solve for x
Horizontal asymptote: Compare degrees of P(x) and Q(x) for asymptote rules

Theorems

Properties of Rational Functions
Degree Comparison for Asymptotes

Suitable Grade Level

Grades 10-12