I got the same answer as Charlie with Excel; and I note the answer appears to be also expressable as: 1858 ^ (1/8).
If you square both sides, then subtract 5 from both sides,
then square both sides, etc etc you would be left with
(5+x) on the left and a long expression on the right which
you could multiply out.
I did not go that far but I suspect it would simplify greatly:
I'm guessing to x^8=1858

Posted by Larry
on 20121218 01:05:41 