difference between x,y,z range

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hi in this code :

f(x,y)=x^2-3*x^4-x^2*y^2+2*x*y    
h(x,y,z)=f(x,y)-z
implicit_plot3d(h, (x, -1,1), (y, -4, 4), (z, -1, 1.5),color="green",adaptive=True,mesh=True)

the result is very large in y because y-range are wider thant x and z-range in my example how can i tell implicitplot3d to take a different scalar in y-range ? i have tried to add plot_points=(1,4,1) because i have understood this in the help but it is not accepted thanks