Question: What is the command to find polynomial from roots?

c := y^2+2*y*x+x^2-y^2*x-y*x^2


{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?

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