# solving logarithm

• December 2nd 2010, 03:49 AM
dugongster
solving logarithm
I can solve basic logarithms but I can't figure out how to solve this one. I tried reviewing the rules of logarithm and I thought that I should start solving from right to left but still can't get a valid answer.

Attachment 19929

Find z.

The selections are a)0 b)1 c)2 d)3

Any ideas ?
• December 2nd 2010, 04:58 AM
hmmmm
Well if you want all that equal to 0 you need the last log to be log of 1.
So log3(9)=2 so you was logz(2)=1
does that help?
• December 2nd 2010, 05:00 AM
FernandoRevilla
We have:

$\log_2[\log_z(\log_39)]=0 \Leftrightarrow \log_2(\log_z2)=0 \Leftrightarrow \log_z2=1 \Leftrightarrow z=2$

Regards.

Fernando Revilla

Edited: Sorry hmmmm I didn't see your post.