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Mathematics 9 Online
OpenStudy (anonymous):

Using the given zero, find one other zero of f(x). Explain the process you used to find your solution. 1 - 2i is a zero of f(x) = x4 - 2x3 + 6x2 - 2x + 5.

OpenStudy (welshfella):

complex zeros occur as conjugate pairs. So if 1 - 2i is a zero then so is 1 + 2i.

OpenStudy (welshfella):

the conjugate has the same real and imaginary parts but the sign is different

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