Robert Latest  wrote:   
   > antispam@math.uni.wroc.pl wrote:   
   > > This is solved using usual quadratic formula, but since coefficients   
   > > of the quadratic are complicated the result is large.  One could   
   > > plug in this y into formula for x, but result would be equally large.   
   > >   
   > > Note: when you look at "general solution" there are subtleties.   
   > > You can see this already from the first solution: there is   
   > > division by d - a.  And indeed, depending on the other parameters   
   > > beside normal case of two solutions there may be one solution,   
   > > no solutions or infinitely many solutions.  Similarely, quadratic   
   > > formula gives "generic solution" and ignores special cases.   
   >   
   > I know all that. I didn't really *need* to find a general solution for the   
   > intersections of two circles. I just took my daughter's homework assignment   
   as   
   > inspiration to play around with a CAS (which I always wanted but didn't have   
   > any reason to). I expected a screenful of messy solutions, but not an empty   
   > result.   
      
   OK.  So use a CAS with reasonable equation solver (and not Maxima   
   which is (in)famous for failures in its solver).   
      
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