1. Warm-up: Match the inequality with the interval notation:
4 < x < 8 A) [4, 8)
4 < x < 8 B) (4, 8]
4 < x < 8 C) [4, 8]
4 < x < 8 D) (4, 8)

2. HW Answers to even problems
pgs #26, 30, 35-44, 57, odd
20. {x/ 0 < x < 8}
26. D: {8, 5, 9, 3}; R: {0, 4, 3, 8}; not a function
30. D: {0, 1}; R: {5, 3, – 4}; not a function
36. D: (–, ); R: (–, 4); function
38. D: [–2, 2]; R: [0, 4]; function
40. D: (–, ); R: [1, ); function
42. D: (–, ); R: (–, ); function
44. D: {– 2,– 1, 0, 5, 9, 10, 13};
R: {5, 0, – 3, 12, 60, 77, 140}; function
type answers to even problems

3. MA Unit 1 Graphical Analysis of Functions
OBJECTIVES and HW:
Find the domain and range of a graph using appropriate notation.
HW: Domain & Range WKS
show website and discuss important features

4. What if the graph wasn’t continuous?
Some functions have holes, or point discontinuities, while others have vertical and/or horizontal asymptotes. In these cases, the domain and/or range will also be discontinuous. It is easier to use interval notation and you need to use the symbol,  , which means “the union” of two sections.
State the domain and range. D: R: ● ○
Use Interwrite Pad to write ans during discussion…highlight x-axis to show where domain is found and then the y-axis for the range

5. What if the graph wasn’t continuous?
State the domain and range of each graph.
A) B)
Domain:
Range:
Domain:
Range:

6. More examples… State the domain and range of each graph.
work with partners to solve first…discuss the difference in notation with the first example and how the domain contains all values between -4 and 4 but the range only contains -3 and 2
An alternate way to write the domain
and range for the last example is:

7. Extension Use the graph of f(x) to answer the following… domain range
values of x where f(x) = 0
values of x where f(x) > 0
values of x where f(x) < 0 o o