Question

calcule z
log9 1/3=z

Answer 1

$9^{z} = \frac{1}{3}\\\\ 3^{2z} = 3^{-1} \\\\ 2z = -1 \\\\ z = -1/2$

;)

Answer 2

             1
log         3    =     z
      9
                z
1   =     9
3

   - 1             2z
3        =    3

- 1 = 2z
2z = - 1
x = - 1/2