Show[Plot3D[{(x^2)+2x (y^2)+(y^4)-(y^5),0}, {x,-1,1},{y,0,2}, AxesLabel->Automatic],Graphics3D[{Red,Ball[{0,1,0},0.025]}]]

Show[Plot3D[{Exp[x y] + Sin[y] + (y^2) - 1 ,0}, {x,1,3},{y,-1,1}, AxesLabel->Automatic],Graphics3D[{Red,Ball[{2,0,0},0.025]}]]

Show[Plot3D[{Sin[x y] + Cos[x y] - 1 ,0}, {x,Pi-1,Pi+1},{y,-1,1}, AxesLabel->Automatic],Graphics3D[{Red,Ball[{Pi,0,0},0.025]}]]

Show[Plot3D[{2(x^4)y+(x^3)+(y^3)+x y -1 ,0}, {x,0,2},{y,-1,1}, AxesLabel->Automatic],Graphics3D[{Red,Ball[{1,0,0},0.025]}]]

Show[Plot3D[{Log[(x^2)+(y^2)+Cos[x y]+y ],0}, {x,-1,1},{y,-1,1}, AxesLabel->Automatic],Graphics3D[{Red,Ball[{0,0,0},0.025]}]]