A =        1.5   B =        1.5   C =          1 
  A =       -1.2   B =       -1.2   C =          1 
  A =      1.125   B =     -1.125   C =         -1 
  A =      1e-30   B =      1e-09   C =      1e-21 
  A =      1e-30   B =      1e-07   C =      1e-23 
  A =      1e+30   B =      1e+09   C =      1e+21 
  A =      1e+30   B =      1e+08   C =      1e+22 
  A =        1.5   B =          1   C =        1.5 
  A =        1.9   B =        1.7   C =    1.11765 
  A =       -3.9   B =        9.8   C =  -0.397959 
  A =         10   B =         -3   C =   -3.33333 
  A =    3.1e+38   B =         10   C =    3.1e+37 
  A =    3.1e+38   B =        0.1   C =   infinity 
  A =        0.1   B =    3.1e+38   C =          0