Precalculus – Section 3.3

How can you use your calculator to find the logarithm of any base?

Change of Base Formula b can be any base you want it to be!

Rewrite the logarithm using common logarithms and natural logarithms

Other “Log” Properties These are true for any base, even for natural logs.

Use the log properties to expand the expression

Use the log properties to expand the expression. 5.

Assignment p. 223: 1-16, odd

Precalculus – Section 3.3

To expand a logarithm means to write a logarithm as the sum or difference of logs. (yesterday’s task) To condense logarithms means to write a sum or difference as one logarithm. (going the other way)

Condense the logarithms

Condense the logarithms. 3.

Assignment p. 323: odd