Question

Using the given zero, find one other zero of f(x).

2 - 4i is a zero of f(x).= x^4 - 4x^3 + 21x^2 - 4x + 20

Answer 1

Complex zeros occur in pairs.
so if a+bi is a zero, its conjugate will also be a zero.
and conjugate of a+bi is a-bi.

Answer 2

here, 2-4i is a zero, what is its conjugate ?

Answer 3

2+4i

Answer 4

yup, thats your other zero :)

Answer 5

Thank you so much (:

Answer 6

welcome ^_^