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Find all roots of the polynomial equation. Use the Rational Zero Theorem, Descartes's Rule of Signs, and possibly the graph of the polynomial function shown

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Find all roots of the polynomial equation. Use the Rational Zero Theorem, Descartes's Rule of Signs, and possibly the graph of the polynomial function shown by a graphing utility as an aid in obtaining the first root.4x^4-14x³ +36x²-84x + 72 = 0The solution set of the equation 4x4-14x3 +36x²-84x + 72=0 is.

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