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Three roots of the polynomial equation x^ 4- 4 x^ 3- 2 x^ 2+ 12 x + 9 = 0 are 3, -1 and -1.
Three roots of the polynomial equationx^4- 4x^3- 2x^2+ 12x+ 9 = 0 are 3, -1 and -1. Explain why the fourth root must be a real number. Find the fourth root.
Out of 22 questions there are four I cannot answer, I am lost on this one
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