1. Splash Screen

2. Five-Minute Check (over Lesson 5–3) CCSS Then/Now New Vocabulary
Example 1: Graph of a Polynomial Function
Key Concept: Location Principle
Example 2: Locate Zeros of a Function
Example 3: Maximum and Minimum Points
Example 4: Real-World Example: Graph a Polynomial Model
Lesson Menu

3. State the degree and leading coefficient of –4x5 + 2x3 + 6.
B. 5; 4
C. 4; 5
D. 8; 6
5-Minute Check 1

4. State the degree and leading coefficient of –4x5 + 2x3 + 6.
B. 5; 4
C. 4; 5
D. 8; 6
5-Minute Check 1

5. Find p(3) and p(–5) for p(x) = 12 – x2.
B. 2; –12
C. 3; –13
D. 4; –14
5-Minute Check 2

6. Find p(3) and p(–5) for p(x) = 12 – x2.
B. 2; –12
C. 3; –13
D. 4; –14
5-Minute Check 2

7. Find p(3) and p(–5) for p(x) = x3 – 10x + 40.
B. 23; –20
C. –15; 20
D. 37; –35
5-Minute Check 3

8. Find p(3) and p(–5) for p(x) = x3 – 10x + 40.
B. 23; –20
C. –15; 20
D. 37; –35
5-Minute Check 3

9. If p(x) = x2 – 3x + 4, find p(x + 2).
A. x2 + 3x + 6
B. x2 + x + 2
C. x – 6
D. x + 4
5-Minute Check 4

10. If p(x) = x2 – 3x + 4, find p(x + 2).
A. x2 + 3x + 6
B. x2 + x + 2
C. x – 6
D. x + 4
5-Minute Check 4

11. Determine whether the statement is sometimes, always, or never true
Determine whether the statement is sometimes, always, or never true. The graph of a polynomial of degree three will intersect the x-axis three times.
A. sometimes
B. always
C. never
5-Minute Check 5

12. Determine whether the statement is sometimes, always, or never true
Determine whether the statement is sometimes, always, or never true. The graph of a polynomial of degree three will intersect the x-axis three times.
A. sometimes
B. always
C. never
5-Minute Check 5

13. Describe the end behavior of the graph of function f(x) = –x2 + 4.
as x → –∞, f(x) → –∞ and as x → +∞, f(x) → –∞
B. as x → –∞, f(x) → –∞ and as x → +∞, f(x) → +∞
C. as x → –∞, f(x) → +∞ and as x → +∞, f(x) → +∞
D. as x → –∞, f(x) → +∞ and as x → +∞, f(x) → –∞
5-Minute Check 6

14. Describe the end behavior of the graph of function f(x) = –x2 + 4.
as x → –∞, f(x) → –∞ and as x → +∞, f(x) → –∞
B. as x → –∞, f(x) → –∞ and as x → +∞, f(x) → +∞
C. as x → –∞, f(x) → +∞ and as x → +∞, f(x) → +∞
D. as x → –∞, f(x) → +∞ and as x → +∞, f(x) → –∞
5-Minute Check 6

15. Mathematical Practices
Content Standards
F.IF.4 For a function that models a relationship between two quantities, interpret key features of graphs and tables in terms of the quantities, and sketch graphs showing key features given a verbal description of the relationship.
F.IF.7.c Graph polynomial functions, identifying zeros when suitable factorizations are available, and showing end behavior.
Mathematical Practices
3 Construct viable arguments and critique the reasoning of others.
CCSS

16. You used maxima and minima and graphs of polynomials.
Graph polynomial functions and locate their zeros.
Find the relative maxima and minima of polynomial functions.
Then/Now

17. Location Principle relative maximum relative minimum extrema
turning points
Vocabulary

18. Graph f(x) = –x3 – 4x2 + 5 by making a table of values.
Graph of a Polynomial Function
Graph f(x) = –x3 – 4x2 + 5 by making a table of values.
Answer:
Example 1

19. Graph f(x) = –x3 – 4x2 + 5 by making a table of values.
Graph of a Polynomial Function
Graph f(x) = –x3 – 4x2 + 5 by making a table of values.
Answer:
Example 1

20. Graph f(x) = –x3 – 4x2 + 5 by making a table of values.
Graph of a Polynomial Function
Graph f(x) = –x3 – 4x2 + 5 by making a table of values.
This is an odd degree polynomial with a negative leading coefficient, so f(x)  + as x  – and f(x)  – as x  +. Notice that the graph intersects the x-axis at 3 points indicating that there are 3 real zeros.
Answer:
Example 1

21. Graph f(x) = –x3 – 4x2 + 5 by making a table of values.
Graph of a Polynomial Function
Graph f(x) = –x3 – 4x2 + 5 by making a table of values.
This is an odd degree polynomial with a negative leading coefficient, so f(x)  + as x  – and f(x)  – as x  +. Notice that the graph intersects the x-axis at 3 points indicating that there are 3 real zeros.
Answer:
Example 1

22. Which graph is the graph of f(x) = x3 + 2x2 + 1?
A. B.
C. D.
Example 1

23. Which graph is the graph of f(x) = x3 + 2x2 + 1?
A. B.
C. D.
Example 1

24. Concept

25. Locate Zeros of a Function
Determine consecutive values of x between which each real zero of the function f(x) = x4 – x3 – 4x2 + 1 is located. Then draw the graph.
Make a table of values. Since f(x) is a 4th degree polynomial function, it will have 0, 2, or 4 real zeros.
Example 2

26. Locate Zeros of a Function
Look at the values of f(x) to locate the zeros. Then use the points to sketch the graph of the function.
Answer:
Example 2

27. Locate Zeros of a Function
Look at the values of f(x) to locate the zeros. Then use the points to sketch the graph of the function.
Answer:
There are zeros between x = –2 and –1, x = –1 and 0, x = 0 and 1, and x = 2 and 3.
Example 2

28. B. x = –1 and x = 0, x = 0 and x = 1, x = 3 and x = 4
Determine consecutive values of x between which each real zero of the function f(x) = x3 – 4x2 + 2 is located.
A. x = –1 and x = 0
B. x = –1 and x = 0, x = 0 and x = 1, x = 3 and x = 4
C. x = –1 and x = 0, x = 3 and x = 4
D. x = –1 and x = 0, x = 0 and x = 1, x = 2 and x = 3
Example 2

29. B. x = –1 and x = 0, x = 0 and x = 1, x = 3 and x = 4
Determine consecutive values of x between which each real zero of the function f(x) = x3 – 4x2 + 2 is located.
A. x = –1 and x = 0
B. x = –1 and x = 0, x = 0 and x = 1, x = 3 and x = 4
C. x = –1 and x = 0, x = 3 and x = 4
D. x = –1 and x = 0, x = 0 and x = 1, x = 2 and x = 3
Example 2

30. Make a table of values and graph the function.
Maximum and Minimum Points
Graph f(x) = x3 – 3x Estimate the x-coordinates at which the relative maxima and relative minima occur.
Make a table of values and graph the function.
Example 3

31. Maximum and Minimum Points
Answer:
Example 3

32. Maximum and Minimum Points
Answer: The value of f(x) at x = 0 is greater than the surrounding points, so there must be a relative maximum near x = 0. The value of f(x) at x = 2 is less than the surrounding points, so there must be a relative minimum near x = 2.
Example 3

33. Enter y = x3 – 3x2 + 5 in the Y= list and graph the function.
Maximum and Minimum Points
Check: You can use a graphing calculator to find the relative maximum and relative minimum of a function and confirm your estimate.
Enter y = x3 – 3x2 + 5 in the Y= list and graph the function.
Use the CALC menu to find each maximum and minimum.
When selecting the left bound, move the cursor to the left of the maximum or minimum. When selecting the right bound, move the cursor to the right of the maximum or minimum.
Example 3

34. Maximum and Minimum Points
Press twice.
ENTER
The estimates for a relative maximum near x = 0 and a relative minimum near x = 2 are accurate.
Example 3

35. A. relative minimum: x = 0 relative maximum: x = –2
Consider the graph of f(x) = x3 + 3x Estimate the x-coordinates at which the relative maximum and relative minimum occur.
A. relative minimum: x = 0 relative maximum: x = –2
B. relative minimum: x = –2 relative maximum: x = 0
C. relative minimum: x = –3 relative maximum: x = 1
D. relative minimum: x = 0 relative maximum: x = 2
Example 3

36. A. relative minimum: x = 0 relative maximum: x = –2
Consider the graph of f(x) = x3 + 3x Estimate the x-coordinates at which the relative maximum and relative minimum occur.
A. relative minimum: x = 0 relative maximum: x = –2
B. relative minimum: x = –2 relative maximum: x = 0
C. relative minimum: x = –3 relative maximum: x = 1
D. relative minimum: x = 0 relative maximum: x = 2
Example 3

37. Graph a Polynomial Model
A. HEALTH The weight w, in pounds, of a patient during a 7-week illness is modeled by the function w(n) = 0.1n3 – 0.6n , where n is the number of weeks since the patient became ill.
Graph the equation.
Make a table of values for weeks 0 through 7. Plot the points and connect with a smooth curve.
Example 4

38. Graph a Polynomial Model
Answer:
Example 4

39. Graph a Polynomial Model
Answer:
Example 4

40. B. Describe the turning points of the graph and its end behavior.
Graph a Polynomial Model
B. Describe the turning points of the graph and its end behavior.
Answer:
Example 4

41. B. Describe the turning points of the graph and its end behavior.
Graph a Polynomial Model
B. Describe the turning points of the graph and its end behavior.
Answer: There is a relative minimum at week 4.
w(n) → ∞ as n → ∞.
Example 4

42. C. What trends in the patient’s weight does the graph suggest?
Graph a Polynomial Model
C. What trends in the patient’s weight does the graph suggest?
Answer
Example 4

43. C. What trends in the patient’s weight does the graph suggest?
Graph a Polynomial Model
C. What trends in the patient’s weight does the graph suggest?
Answer: The patient lost weight for each of 4 weeks after becoming ill. After 4 weeks, the patient gained weight and continues to gain weight.
Example 4

44. D. Is it reasonable to assume the trend will continue indefinitely?
Graph a Polynomial Model
D. Is it reasonable to assume the trend will continue indefinitely?
Answer:
Example 4

45. D. Is it reasonable to assume the trend will continue indefinitely?
Graph a Polynomial Model
D. Is it reasonable to assume the trend will continue indefinitely?
Answer: The trend may continue for a few weeks, but it is unlikely that the patient’s weight will rise indefinitely.
Example 4

46. A. WEATHER The rainfall r, in inches per month, in a Midwestern town during a 7-month period is modeled by the function r(m) = 0.01m3 – 0.18m m , where m is the number of months after March 1. Graph the equation.
A. B.
C. D.
Example 4

47. A. WEATHER The rainfall r, in inches per month, in a Midwestern town during a 7-month period is modeled by the function r(m) = 0.01m3 – 0.18m m , where m is the number of months after March 1. Graph the equation.
A. B.
C. D.
Example 4

48. B. WEATHER Describe the turning points of the graph and its end behavior.
A. There is a relative minimum at Month 2. r(m) decreases as m increases.
B. There is a relative maximum at Month 2. r(m) decreases as m increases.
C. There is a relative maximum at Month 2. r(m) increases as m increases.
D. There is a relative minimum at Month 2. r(m) decreases as m decreases.
Example 4

49. B. WEATHER Describe the turning points of the graph and its end behavior.
A. There is a relative minimum at Month 2. r(m) decreases as m increases.
B. There is a relative maximum at Month 2. r(m) decreases as m increases.
C. There is a relative maximum at Month 2. r(m) increases as m increases.
D. There is a relative minimum at Month 2. r(m) decreases as m decreases.
Example 4

50. A. The rainfall decreased the first two months, then increased.
C. WEATHER What trends in the amount of rainfall received by the town does the graph suggest?
A. The rainfall decreased the first two months, then increased.
B. The rainfall increased the first two months, then decreased.
C. The rainfall continued to increase throughout the entire 8 months.
D. The rainfall continued to decrease throughout the entire 8 months.
Example 4

51. A. The rainfall decreased the first two months, then increased.
C. WEATHER What trends in the amount of rainfall received by the town does the graph suggest?
A. The rainfall decreased the first two months, then increased.
B. The rainfall increased the first two months, then decreased.
C. The rainfall continued to increase throughout the entire 8 months.
D. The rainfall continued to decrease throughout the entire 8 months.
Example 4

52. D. Is it reasonable to assume the trend will continue indefinitely?
A. yes
B. no
Example 4

53. D. Is it reasonable to assume the trend will continue indefinitely?
A. yes
B. no
Example 4

54. End of the Lesson