1. L OGARITHMS R EVIEW N OTES

2. L OGS A logarithm is an exponent. Logarithms are the phase is working with exponent problems. Past Ways of Solving: 4 2 =x 4*4= 16 x= 16 x 2 = 81 x= +/- 9

3. P ROPERTIES Logarithmic Form vs. Exponential Form MEANS

4. C HANGE OF BASE FORMULA The typical base for all logs is a base of 10. This is called a common log. If the base is anything other than 10 you have to do change of base formula before you can solve. Examples: 1.

5. N ATURAL L OGS A natural log a log with a base of “e”. “e” is an irrational number (like pi).