Question: Find all zeros of the polynomial function. Use the Rational ZeroTheorem, Descartes's Rule ofSigns, and possibly the graph of the polynomial function shown by a

Find all zeros of the polynomial function. Use the Rational ZeroTheorem, Descartes's Rule ofSigns, and possibly the graph of the polynomial function shown by a graphing utility as an aid in obtaining the first zero or the first root.

F(x) = x^4 - 2x^3 + 78x^2 + 166x +85

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