Simple question

Hi!

I'm a new Axiom user, so this is probably a very simple question, but it
really puzzles me:

(1) -> solve(x^10-1024, 1)

   (1)  [x= - 2,x= 2]
                         Type: List Equation Polynomial Fraction Integer


(2) -> solve(2^x-1024, 1)
   There are 20 exposed and 3 unexposed library operations named solve 
      having 2 argument(s) but none was determined to be applicable. 
      Use HyperDoc Browse, or issue
                              )display op solve
      to learn more about the available operations. Perhaps 
      package-calling the operation or using coercions on the arguments
      will allow you to apply the operation.
 
   Cannot find a definition or applicable library operation named solve
      with argument type(s) 
                             Expression Integer
                               PositiveInteger
      
      Perhaps you should use "@" to indicate the required return type, 
      or "$" to specify which version of the function you need.
(2) -> 


First question: What is so different about those two expressions?
Second question: How do I fix it?

The problem I actually wanted to solve was:
solve((250/x)^x-6000000000,1.e-5)

..which also doesn't work, but I expect that the answer to that will be
clear to me when my second question from above is answered.

-- 
Cheers, Søren.

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