math - maple cant calculate my function -

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Let me start for my bad english I am trying to do some math in Mapple.

My Function 

  func (x) = x * e ^ (- x) -0.06064

I f (0.05) * F (0.06) & lt; 0 bn: = 0 mn: = 0.06 a: = 0.05 (evalf (subs = Lieutenant; 0 then bien: = mn;

But maple says:

This expression is not right or wrong, can not determine: (0.6000000000e-1 / e ^ 0.64692635994760e-1-0.6064e -1) * (0.5-1 / E ↑ 0.64692635994760e-1-0.6064e-1) & lt; 0

Can I do something to calculate it? The main difficulty is that the notion of maple is done in the power by the natural logarithm, 

  exp (-x)

and do not like it, / P> 

  e ^ (-x)   
 Note the presence of the name  e  in the error message you received. There is no special meaning in the 1D maple notation input of the name  e  in maple. 
 
 Perhaps you stuck in those calls to  evalf  because you were trying to solve your problem with  e  in your example floats There is enough sexual intercourse to call unnecessary calls to  evalf . 
 
 You may be interested in these two forms to get a real float from your formula. I leave the unnecessary  evalf  call here. 
 
 Here is the  func  defined as an expression. 
  restart: Func: = x * exp (-x) - 0.06064: bn: = 0: mn: = 0.06: one: = 0.0: eval (func, x = mn) * eval (Func, x = a); 0.0002506935207

And here is the func defined as an operator. 

  restart: func: = x - & gt; X * exp (-x) -0.06064: bn: = 0: mn: = 0.06: one: = 0.0: funk (mn) * funk (a); 0.0002506935207

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