# logarithmic functions and their graphs

#### retro

The problem: Choose 2 numbers and add their common logarithms. Then find the common logarithm of the product of those 2 numbers. What do you observe? Does it work for 3 numbers?

What I know: common logarithms use base-10.

What I think I know: a logarithm is an exponent.

#### romsek

MHF Helper
I guess what they are after is that $\log(abc) = \log(a)+\log(b)+\log(c)$

it's a standard property of logarithms

#### retro

Thank u, appreciate the help