Question 1000772
.
Notice that 


{{{log(5, (1/5))}}} = -1,

{{{log(5, (1))}}} = 0,

{{{log(5, (5))}}} = 1,

{{{log(5, (25))}}} = 2.


Thus you just have 4 points to make a plot like this one below

<TABLE> 
  <TR>
  <TD> 

{{{graph( 330, 330, -1.5, 25.5, -1.5, 3.5,
          log(5, x)
)}}}


<B>Figure</B>. Plot y = {{{log(5, x)}}}

  </TD>
  </TR>
</TABLE>