Thread: Logarithm #2

Could someone please help me out :

I read this in a book just now:

3 log30 30/15 = 3 [1- log30 3 - log30 5]

Can someone show how this is possible

Originally Posted by Satyajith

Could someone please help me out :

I read this in a book just now:

3 log30 30/15 = 3 [1- log30 3 - log30 5]

Can someone show how this is possible

Just use the properties of log a few times .

3log 30/15=3(log 30-log 15)

then log 30=1 and log 15=log 5 + log 3

i meant log to the base 30.