Math Problem Statement
List the domain and the x- and y-intercepts of the following function. Graph the function. Be sure to label all the asymptotes.
f left parenthesis x right parenthesis equals StartFraction x minus 1 Over x squared minus 5 x minus 6 EndFraction
Solution
We are given the function:
Step 1: Domain of the function
The domain of a function refers to the set of all -values where the function is defined. For rational functions like this one, the function is undefined where the denominator is zero.
Let's find the values of that make the denominator zero:
Factor the quadratic:
The solutions are and .
Thus, the function is undefined at and . Therefore, the domain is:
Step 2: - and -intercepts
- -intercepts: To find the -intercept(s), set . A rational function equals zero when the numerator equals zero, as long as the denominator is non-zero.
Set the numerator equal to zero:
Thus, . So, the -intercept is at , or the point .
- -intercept: To find the -intercept, set and solve for :
Thus, the -intercept is at the point .
Step 3: Asymptotes
- Vertical asymptotes: These occur where the denominator is zero and the numerator is non-zero. From the factored form of the denominator, we have vertical asymptotes at:
- Horizontal asymptote: Since the degree of the denominator (2) is greater than the degree of the numerator (1), the horizontal asymptote is at:
Step 4: Graph the function
The graph will show:
- Vertical asymptotes at and ,
- A horizontal asymptote at ,
- An -intercept at ,
- A -intercept at .
Let me know if you'd like me to graph this function for you.
Would you like further details or clarifications? Here are 5 related questions that can deepen your understanding:
- How do vertical asymptotes affect the shape of the graph near these values of ?
- What happens to the function's value as approaches infinity or negative infinity?
- How can you determine if there are slant (oblique) asymptotes in a rational function?
- What is the significance of horizontal asymptotes in terms of the function's end behavior?
- How can the factored form of the denominator help in identifying intercepts and asymptotes more quickly?
Tip: When analyzing rational functions, always check both the numerator and denominator for factors to simplify identifying intercepts and asymptotes!
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Math Problem Analysis
Mathematical Concepts
Rational Functions
Intercepts
Asymptotes
Domain
Formulas
Rational function: f(x) = (numerator)/(denominator)
Quadratic factorization: x^2 - 5x - 6 = (x - 6)(x + 1)
Theorems
Factoring Quadratics
Asymptote Behavior in Rational Functions
Suitable Grade Level
Grades 10-12
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