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10 March, 11:47

Using the given zero, 2 - 4i, find one other zero of f (x) = x4 - 4x3 + 21x2 - 4x + 20

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  1. 10 March, 13:26
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    For polynomials, complex zeros always come in conjugate pairs.

    So if 2-4i is a zero of the given polynomial,

    then 2+4i must be another.
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