Question 888211
First, you have to be able to read the expression
Remember that logs are exponents.
You are just specifying the base of the exponent
and then calling it a log
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{{{ log( a, 125 ) }}}
It's saying " This expression is a log ( exponent )"
The base for this log is {{{ a }}}
Finally, it is saying " When I raise {{{ a }}} to this
certain log, I get {{{ 125 }}} as a result"
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To solve the problem, you need one rule:
{{{ log( a, b^c ) = c*log( a, b ) }}} 
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I can say:
{{{ log( a, 125 ) = log( a, 5^3 ) }}}
Using the rule:
{{{ log( a, 5^3 ) = 3*log( a, 5 ) }}}
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Hope this helps. You really need a grounding
in the basics of logs to get anywhere with
this stuff. Anything you don't completely
understand will come back and bite you
sooner or later. Good luck.