1. Pre-calc w-up 10/27 #1-2 Evaluate
#3 write in rational form & #4 write in simplified radical form

2. 11.2 Exponential Functions
Read the text book pg and answer the following questions.
1) What is a power function, give an example
What is an exponential function, what are the characteristics, give an example.
What is the difference between exponential growth and decay? Is there a formula? Give an example.
What is compound interest, is there a formula?

3. Exponential Function General Form:
y intercept or starting value
Growth/decay rate
If b > 1 Growth
If 0 < b < 1 Decay

4. Ex. A State whether the function shows growth or decay, state the y intercept and the growth/decay rate.
Y int = 3
Y int = 3
Growth rate is 2
Decay rate is
What do the graphs look like?

5. Graphing: You must label at least four points (some negative)
If it is an inequality you must show your check.
Ex1: graph y > 2x – 3
Check (0,0) in the original equation:
IS 0 > 20 -3 x y -2
-2.75 1 -1 3 5
YES so shade towards the pt you picked (0,0)
(3,5)
(1,-1)
(0,-2)
(-2,-2.75)
This dotted line is the asymptote, what part of the equation did it come from?

6. Try on your own
5. y < 3x 6. y = 3-x

7. C) graph the depreciation
Ex2: A car depreciates at the rate of 20%. If the car originally cost $20,000 then
A) write the equation that models the depreciation.____________________
B) find the value of the car at the end of 2 years.________________________
C) graph the depreciation
A=20,000(1-0.20)t
A=20,000(1-0.20)2 = $12,800

8. Homework: pg # 10-21, all