Originally Posted by

**kellyliu** i have a advance algebra question is about LOG.!

Can someone help me with these questions?

I need to prove each property by using the format like this:

Change of Base

Let y=LOGa X

1.then a to the power of y=x definition of logarithm.

2.LOGb a to the power of y=LOGb X take LOGb of both sides

3.y times LOGb a=LOGb X log of a power

4.y= LOGb X / LOGb a, QED divide by LOGb a

CAN SOMEONE HELP ME WITH THE FOLLWOING QES?

Direct Proportionality

LOGa=(c)(LOGb X),where c is a constant.

**A)** Product of two logs

(LOGa B)(LOGb C)=LOGa C

**B)** log with a power for its base

LOG(b to the power n) X=1/n LOGb X

**C)** base and argument are reciprocals

LOG1/b 1/X =LOGb X

I NEED IT FOR TOMORROW!!

THANK YOU SO MUCH!!