7-4 notes Logarithms Your calculator is programmed to do 2 kinds of logs common logs
=
= 0.47712
Natural logs ln3=
= 1.0986
not common nor natural
logarithm form can be changed to exponential form and vice versa logarithmic log power answer base =
exponential
Without a calculator log 8 = 3 2 = log 25 = 2 5 log 9 = x 3 ln 2.1718 = 1 e
Inverse properties When the base is repeated, the number and the log cancel sometimes you have to simplify the number first