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

1 answer
Question:

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

Answers

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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