7.1

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7.1

  1. 1. 7.1 EXPLORING EXPONENTIALMODELS Chapter 7: Exponential and Logarithmic Functions
  2. 2. Exponential Functions The general form of an exponential function is where x is a real number, a ≠ 0, b > 0, and b ≠ 1. To graph an Exponential Function: create a table of values and plot the points  Example: Graph
  3. 3. Exponential Functions Exponential Functions always have the curved shape They also have an asymptote, a line that the graph approaches but never touches or crosses The domain is all real numbers. The range is y > 0
  4. 4. Exponential Functions There are two types of exponential behaviorExponential Exponential Decay Growth  As the value of x As the value of x increases, the value increases, the value of y decreases of y increases
  5. 5. Exponential Functions For the function  If a > 0 and b >1, the function represents exponential growth  If a > 0 and 0 < b < 1, the function represents exponential decay  The y-intercept of the graph is at (0, a)  The asymptote is y = 0
  6. 6. Without graphing, determine whether the functionrepresents exponential growth or decay. Then findthe y-intercept.  
  7. 7. Exponential Growth and Decay In the function , b represents the growth or decay factor.  If b > , then it is the growth factor  If 0 < b < 1, then it is the decay factor
  8. 8. Exponential Growth and Decay To model exponential growth and decay we use the following function To use this function: 1. Identify the value of the variables 2. Plug the known values into the equation 3. Solve for the  For growth or decay to be exponential,unknown value a quantity changes by a fixed percentage each time period
  9. 9. Example: Page 436 You invested $1000 in a savings account at the end of the 6th grade. The account pays 5% annual interest. How much money will be in the account after 6 years?
  10. 10. Homework P. 439 #1 – 6 all, 8, 10 – 25 odd, 26 (parts a & b), 27, 28

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