Exponential Growth. b.) What will the population be in 3 years?
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2 Eponential Growth y = a b a b Suppose your school has 4512 students this year. The student population is growing 2.5% each year. a.) Write an equation to model the student population. b.) What will the population be in 3 years? 1
3 Eponential Decay y = a b a b The value of a $1200 computer decreases 27% annually. What will be the value of the computer after 3 years? 2
4 Graphing Eponential Functions Domain: Eponential Decay: Eponential Growth: Eample: Eample: Eample: Eample: 3
5 Domain and Range Domain: Range: Asymptote: f() = 0.5 f() = 2 -intercept: y-intercept: domain: range: -intercept: y-intercept: domain: range: 4
6 Tables Equations Situations Graphs Coordinates Linear Versus Eponential Tables Equations Situations Graphs 5 Coordinates
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9 Graphing Eponential Functions 1. f ( ) 4 y f y
10 f y f ( ) 2 2 y
11 Graphing Eponential Functions Part 1: Graph the function f() = 2 and sketch the graph on the grid provided below. Create a table of values to help you graph. 1.) Is the graph increasing or decreasing? Eplain your answer. 2.) Use your table of data points to help you answer the following question. a.) As the value of gets very large (5, 10, 15, etc.), what happens to the value of 2? b.) As the value of gets very small (-15, -10, -5, etc.), what happens to the value of 2? 3.) Will the value of 2 ever equal 0? Eplain your answer. 4.) Are there any values of that would make 2 undefined? Eplain your answer. 10
12 Part 2: Graph the function f() = 3 along with the graph of f() = 2 from Part I, and sketch the graph of f() = 3 on the grid provided below. 1.) Is the graph increasing or decreasing? Eplain your answer. 2.) Use your table of data points to help you answer the following question. a.) As the value of gets very large (5, 10, 15, etc.), what happens to the value of 3? b.) As the value of gets very small (-15, -10, -5, etc.), what happens to the value of 3? 3.) How does the graph of y = 3 compare to the graph of y = 2? 4.) a. Given the general form f() = a (where a > 1), what effect does increasing the value of "a" have upon the graph? b. What effect does decreasing the value of "a" have upon the graph? 11
13 Part 3: Graph the function f() = 0.5 along with the graph of f() = 2 from Part I, and sketch the graph of f() = 0.5 on the grid provided below. 1.) Is the graph increasing or decreasing? Eplain your answer. 2.) Use your table of data points to help you answer the following question. a.) As the value of gets very large (5, 10, 15, etc.), what happens to the value of 0.5? b.) As the value of gets very small (-15, -10, -5, etc.), what happens to the value of 0.5? 3.) Will the value of 0.5 ever equal 0? Eplain your answer. 4.) Are there any values of that would make 0.5 undefined? Eplain your answer. 5.) How does the graph of y = 0.5 compare to the graph of y = 2? 12
14 Part 4: Graph the function f() = 0.8 along with the graph of f() = 0.5 from Part 3, and sketch the graph of f() = 0.8 on the grid provided below. 1.) Is the graph increasing or decreasing? Eplain your answer. 2.) Use your table of data points to help you answer the following question. a.) As the value of gets very large (5, 10, 15, etc.), what happens to the value of 0.8? b.) As the value of gets very small (-15, -10, -5, etc.), what happens to the value of 0.8? 3.) Will the value of 0.8 ever equal 0? Eplain your answer. 4.) Are there any values of that would make 0.8 undefined? Eplain your answer. 5.) How does the graph of y = 0.8 compare to the graph of y = 0.5? 6.) a. Given the general form f() = a (where 0 <a < 1), what effect does increasing the value of "a" have upon the graph? b. What effect does decreasing the value of "a" have upon the graph? Write a response: Eplain the similarities and differences between eponential functions when a > 1 versus 0 < a < 1. 13
15 Graphing Eponential Functions 14
16 & The domain of a function demonstrates the values. The range of a function demonstrates the values. 1.) Here is the graph of f() = 2. -intercept: y-intercept: Domain: Range: 2.) Here is the graph of f() = ( 2 3 ) 2. -intercept: y-intercept: Domain: Range: 3.) Here is the graph of f() = ( 2 3 ) 2. -intercept: y-intercept: Domain: Range: 15
17 4.) y = 100 (2) What is the domain of the situation? Eplain your answer. What is the range of the situation? Eplain your answer. 5.) y = 2 (100) What is the domain of the situation? Eplain your answer. What is the range of the situation? Eplain your answer. 6.) y = 20 (2) What is the domain of the situation? Eplain your answer. What is the range of the situation? Eplain your answer. 7.) y = 2 (20) What is the domain of the situation? Eplain your answer. What is the range of the situation? Eplain your answer. 8.) y = 2.5 What is the domain of the situation? Eplain your answer. What is the range of the situation? Eplain your answer. 16
18 Domain & Range for Eponential Functions Directions: Plot at least 5 Points for each graph & Complete the Chart: 1. y 3 Equation Equation of Asymptote Domain Range Increasing or Decreasing 2. y y y y y 3 1 y 3 1 y 3 1 y 3 1 y y
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20 Linear vs. Eponential TGECS Linear vs. Eponential Tables Determine if each table is linear or eponential. Defend your answer. Determine the slope OR the growth factor. 1.) 2.) X f() X f() ) 4.) X f() X f() Linear vs. Eponential Graphs Determine if each graph is linear or eponential. Defend your answer. 5.) 6.) 20
21 7.) 8.) Linear vs. Eponential Equations Determine if each equation is linear or eponential. Defend your answer. Determine the slope OR the growth factor. 9.) f() = ) f() = ) y = ) y = (1 2 ) Linear vs. Eponential Coordinates Determine if each set of coordinates is linear or eponential. Defend your answer. 13.) (0, 0), ( 1, 1), (1, 1), (2, 2) 14.) ( 1, 4), ( 1 2, 2), (0, 1), (1, 1 4 ) 15.) (0, 1), (1, ), (2, ), ( 1, 3 4 ) 16.) (0, 1), ( 1, 1 4 ), (1, 4), (1 1 2, 8) 21
22 Linear vs. Eponential Situations Determine if each situation is linear or eponential. Defend your answer. 17.) The amount of money you earn each hour is $ ) The amount of money you will make if you salary doubles each month. 19.) A phone company charges a monthly rate of $25 and $0.10 per minute. 20.) The original value of a painting is $9,000 and the value increases by 7% each year. 22
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