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Try

 sage: plot(h(x),-4,4)

Unfortunately, polynomial plotting is from another era.

To the cognoscenti: why does this example from

sage: sage.rings.polynomial.polynomial_element.Polynomial.plot?

"work"? Shouldn't it raise an error with the endpoints?

sage: x = polygen(GF(389))
sage: plot(x^2+1,(-1,1))

Also, it is interesting that this is the doc that comes up, since there are branches for both characteristic zero and finite, and we don't test the char zero one!