Solve each logarithmic equation.  

1. $\log(x)+\log(x)=4$ 

   Step (a):

   $\log(x^2)=4$

   Hint (a):

   Rewrite the equation in exponential form. Remember that the base in this case is $10$.

   More Help (a):

   Recall that the domain of the basic logarithmic function is $x>0$.

2. $\log_2(16)−\log_2(x)=5$ 

   Step (b):

   $\log_2\left(\frac{16}{x}\right)=5$

3. $\log_3(3^8)=x$ 

   Hint (c):

   Rewrite the equation in exponential form.