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Mathematics, 09.12.2020 23:30 bellbug08

Three roots of a polynomial equation with real coefficients are 3, 5-3i, and -3i. Which number MUST also be a root of the equation?
I.-3
II. 5+3i
III. 3i

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Three roots of a polynomial equation with real coefficients are 3, 5-3i, and -3i. Which number MUST...
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