c := y^2+2*y*x+x^2-y^2*x-y*x^2
solve(c);
{x = -y, y = y}, {x = y/(-1+y), y = y}
above polynomial find roots using solve
if do reverse to find back its polynomial c from {x = -y, y = y}, {x = y/(-1+y), y = y}
any command to do this? is it possible to do this? which book teach this?
