# Thread: Help with log Proofs

1. ## Help with log Proofs

Hi All,

Need a quick hand please with a study question:

I need to prove that

$
log5/36 - log5/9 = -log4
$

I thought that maybe rule three might work but I got really lost there...

Anyhelp or a steer in the right direction would be greatly appreciated.

Cheers,

Perjac

2. Originally Posted by perjac
Hi All,

Need a quick hand please with a study question:

I need to prove that

$
log5/36 - log5/9 = -log4
$

I thought that maybe rule three might work but I got really lost there...

Anyhelp or a steer in the right direction would be greatly appreciated.

Cheers,

Perjac
I'm going to simplify the left hand side:

$\log\frac{5}{36}-\log\frac{5}{9} =\log\frac{\frac{5}{36}}{\frac{5}{9}}=\log\frac{9} {36}=\log4^{-1}=-\log4$

Do you see all that?
Hope I helped

3. Legendary. Thanks.