Question 826073
I am sure it is a base 10 logarithm.
I just do not know if the 10 is supposed to be the base, or the base is omitted because it is base 10.
So I'll solve both problems.
  
{{{log(10,x)=-8}}} --> {{{x=10^(-8)=0.00000001}}}
 
{{{log((10x))=-8}}} --> {{{10x=10^(-8)}}} --> {{{x=10^(-8)/10}}} --> {{{x=10^(-9)}}}