3x^(2)+2xy-y^(2)+2x-2y-13y^(4)+6y^(2)-9
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3x^(2)+2xy-y^(2)+2x-2y-13y^(4)+6y^(2)-93x^(2)+2xy-y^(2)+2x-2y-13y^(4)+6y^(2)-93x^(2)+2xy-y^(2)+2x-2y
3x^(2)+2xy-y^(2)+2x-2y-13y^(4)+6y^(2)-9
3x^(2)+2xy-y^(2)+2x-2y-1
3y^(4)+6y^(2)-9
3x^(2)+2xy-y^(2)+2x-2y-13y^(4)+6y^(2)-9
3x^(2)+2xy-y^(2)+2x-2y-1
=(3x-y)(x+y)+2x-2y-1
=(3x-y-1)(x+y+1)
3y^(4)+6y^(2)-9
=3[y^(4)+2y^(2)-3]
=3(y^2+3)(y^2-1)
=3(y^2+3)(y+1)(y-1)
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