1. L8-3 Obj: Students will use definition of log

3. Use definition of log and write in logarithmic form

5. Ex 2:
Evaluate log3 81.

6. Domain and Range of logs

9. Find the domain and the range
Ex 4: graph y = 2x
Find the domain and the range x y

10. By definition of logarithm, y = log4 x is the inverse of y = 4x.
Logarithmic Functions as Inverses
LESSON 8-3
Additional Examples
Graph y = log4 x.
By definition of logarithm, y = log4 x is the inverse of y = 4x.
Step 1: Graph y = 4x.
Step 2: Draw y = x.
Step 3: Choose a few points on 4x. Reverse the coordinates and plot the points of y = log4 x.

11. Practice

12. Homework L8-3 (p 458) #6-24e 54-60e 76-84e