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Complex Zeros and the Fundamental Theorem of Algebra
It can be shown that if a + bi is a zero of a polynomial function with real coefficients, then so is its complex conjugate, a – bi. Conjugate Zeros Theorem
If P(x) defines a polynomial function having only real coefficients, and if a + bi is a zero of P(x), then the conjugate a – bi is also a zero of P(x).
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