Question 39440
{{{ 5^(2x) = 8 }}}


Take logs - to base 5 of both sides:
{{{ 2x = log8 }}} --> this log is base5


and now convert this to a base10 calculation, so that you can use your calculator:
{{{ 2x = (log(8))/(log(5)) }}} --> this is base10
{{{ x = (log(8))/(2log(5)) }}} --> this is base10


jon.