Using the given zero, find all other zeros of f(x).2 - 4i is a zero of f = x4 - 4x3 + 21x2 - 4x + 20.

A. 2 + 4i, i, -i
B. -2 - 4i, 1 + i, 1 - i
C. 2 + 4i, 1 + i, 1 - i
D. 2 + 4i, 1, -1


Answer: A

Mathematics

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