how to plot a polynomial?

2020 5 27
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更新时间：2020 5 27
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Does anyone know how to plot this polynomial?
p(z) = z^9 + z^8 − z^7 + z^6 − z^5 + z + 1 for z real and −1 ≤ z ≤ 1
then, find and plot the roots of p(z) in the complex plane.
• Label the axes.
Please help, thank you!

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