Question: f(x) is a polynomial function of degree 4 whose coefficients are real numbers; three of its zeros are 2, 1 + 2i, and 1

f(x) is a polynomial function of degree 4 whose coefficients are real numbers; three of its zeros are 2, 1 + 2i, and 1 – 2i. Explain why the remaining zero must be a real number.

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