S Satyajith Jun 2010 4 0 Jun 1, 2010 #1 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 (Nod) Last edited by a moderator: Jun 2, 2010

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 (Nod)

M mathaddict Sep 2008 1,261 539 West Malaysia Jun 1, 2010 #2 Satyajith said: 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 (Nod) Click to expand... 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. Last edited by a moderator: Jun 2, 2010 Reactions: Satyajith

Satyajith said: 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 (Nod) Click to expand... 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.