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Fact implies every complex number satisfies a polynomial

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We know that [C:R]=2. Explain why this fact implies every complex number satisfies a polynomial with real number coefficients of degree 1 or 2.

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The facts implied for every complex number who satisfies a polynomial are determined.

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We know that [C:R]=2. Explain why this fact implies every complex number satisfies a polynomial with real number coefficients ...

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