<PRE><B>Question 610307</B>
&lt;pre&gt;
     log&lt;sub&gt;5&lt;/sub&gt;(x + 4) = 2

Learn the definition rule carefully for writing a 
log equation as an exponential equation and vice-versa:
      
           This log equation:

         log&lt;sub&gt;B&lt;/sub&gt;(A) = C

           is by definition equivalent to this exponential equation

               A = B&lt;sup&gt;C&lt;/sup&gt; 

   
Using this definition rule,

     log&lt;sub&gt;5&lt;/sub&gt;(x + 4) = 2

becomes:

           x + 4 = 5&lt;sup&gt;2&lt;/sup&gt;

           x + 4 = 25

               x = 21

Edwin&lt;/pre&gt;
                         </PRE>