Coding challenge

Write some code that will plot this polynomial $-x^3 - x^2 + 2 x$ between $x=-3$ and $x=2.$ Find the zeros of this polynomial from your graph. You can make a quick plot like this:
k = 0
for x= ??,??,?? do
  px[k] = x
  py[k] = some function of x
  k = k + 1
This fills the arrays px and py with points, so lineplot can plot them.

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