### Home > PC > Chapter 5 > Lesson 5.2.2 > Problem 5-63

5-63.

4 and 5 should be multiplied, not added.

The base should not change.

The log of a product is the SUM of the logs.

There is no rule for log(4 + 5). Just add them.

5-63.

4 and 5 should be multiplied, not added.

The base should not change.

The log of a product is the SUM of the logs.

There is no rule for log(4 + 5). Just add them.