3 Polynomial and Rational Functions © 2008 Pearson Addison-Wesley. All rights reserved Sections 3.5–3.6.

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3 Polynomial and Rational Functions © 2008 Pearson Addison-Wesley. All rights reserved Sections 3.5–3.6

Copyright © 2008 Pearson Addison-Wesley. All rights reserved Rational Functions: Graphs, Applications, and Models 3.5 The Reciprocal Function ▪ The Function ▪ Asympototes ▪ Steps for Graphing Rational Functions ▪ Rational Function Models

Copyright © 2008 Pearson Addison-Wesley. All rights reserved Example 1 Graphing a Rational Function (page 360) Graph. Give the domain and range. The expression can be written as, indicating that the graph can be obtained by stretching the graph of vertically by a factor of 4. Domain: Range:

Copyright © 2008 Pearson Addison-Wesley. All rights reserved Example 2 Graphing a Rational Function (page 361) Graph. Give the domain and range. Shift the graph of three units to the right, then reflect the graph across the x-axis to obtain the graph of. The horizontal asymptote is y = 0, the x-axis. The vertical asymptote is x = 3.

Copyright © 2008 Pearson Addison-Wesley. All rights reserved Example 2 Graphing a Rational Function (cont.) Domain: Range:

Copyright © 2008 Pearson Addison-Wesley. All rights reserved Graph. Give the domain and range. To obtain the graph of, shift the graph of two units to the right, stretch the graph vertically by a factor of two, and then shift the graph four units down. The vertical asymptote is x = 2. The horizontal asymptote is y = – Example 3 Graphing a Rational Function (page 363)

Copyright © 2008 Pearson Addison-Wesley. All rights reserved Domain: Range: 3.5 Example 3 Graphing a Rational Function (cont.)

Copyright © 2008 Pearson Addison-Wesley. All rights reserved Example 4(a) Finding Asymptotes of Rational Functions (page 364) Find all asymptotes of the function To find the vertical asymptotes, set the denominator equal to 0 and solve. The equations of the vertical asymptotes are x = –4 and x = 4. The numerator has lower degree than the denominator, so the horizontal asymptote is y = 0.

Copyright © 2008 Pearson Addison-Wesley. All rights reserved Example 4(b) Finding Asymptotes of Rational Functions (page 364) Find all asymptotes of the function To find the vertical asymptotes, set the denominator equal to 0 and solve. The equation of the vertical asymptote is. The numerator and the denominator have the same degree, so the equation of the horizontal asymptote is

Copyright © 2008 Pearson Addison-Wesley. All rights reserved Example 4(c) Finding Asymptotes of Rational Functions (page 364) Find all asymptotes of the function To find the vertical asymptotes, set the denominator equal to 0 and solve. The equation of the vertical asymptote is x = 3. Since the degree of the numerator is exactly one more than the denominator, there is an oblique asymptote.

Copyright © 2008 Pearson Addison-Wesley. All rights reserved Example 4(c) Finding Asymptotes of Rational Functions (cont.) Divide the numerator by the denominator and, disregarding the remainder, set the rest of the quotient equal to y to obtain the equation of the asymptote. The equation of the oblique asymptote is y = 2x + 6.

Copyright © 2008 Pearson Addison-Wesley. All rights reserved Example 5 Graphing a Rational Function That Does Not Intersect its Horizontal Asymptote (page 367) Graph Step 1: Find the vertical asymptote by setting the denominator equal to 0 and solving. Step 2: Find the horizontal asymptote. The numerator has the same degree as the denominator, so the horizontal asymptote is y = 4.

Copyright © 2008 Pearson Addison-Wesley. All rights reserved Example 5 Graphing a Rational Function That Does Not Intersect its Horizontal Asymptote (cont.) Step 3: Find the y-intercept. Step 4: Find the x-intercept.

Copyright © 2008 Pearson Addison-Wesley. All rights reserved Example 5 Graphing a Rational Function That Does Not Intersect its Horizontal Asymptote (cont.) Step 5: Determine whether the graph intersects its horizontal asymptote. Solve f(x) = 4 (y-value of the horizontal asymptote). The graph does not intersect its horizontal asympote.

Copyright © 2008 Pearson Addison-Wesley. All rights reserved Example 5 Graphing a Rational Function That Does Not Intersect its Horizontal Asymptote (cont.) Step 6: Choose a test point in each of the intervals determined by the x-intercept and the vertical asymptote to determine how the graph behaves.

Copyright © 2008 Pearson Addison-Wesley. All rights reserved Example 5 Graphing a Rational Function That Does Not Intersect its Horizontal Asymptote (cont.) Step 7: Plot the points and sketch the graph.

Copyright © 2008 Pearson Addison-Wesley. All rights reserved Example 6 Graphing a Rational Function Defined by an Expression That is not in Lowest Terms (page 370) Graph The domain of f cannot include 3. In lowest terms, the function becomes

Copyright © 2008 Pearson Addison-Wesley. All rights reserved Example 6 Graphing a Rational Function Defined by an Expression That is not in Lowest Terms (cont.) The graph of f is the same as the graph of y = x + 2, with the exception of the point with x-value 3. A “hole” appears in the graph at (3, 5).

Copyright © 2008 Pearson Addison-Wesley. All rights reserved Example 6 Graphing a Rational Function Defined by an Expression That is not in Lowest Terms (cont.) If the window of a graphing calculator is set so that an x-value of 3 is displayed, then the calculator cannot determine a value for y. Notice the visible discontinuity at x = 3. The error message in the table supports the existence of the discontinuity.