Question

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

-2i is a zero of f(x) = x^4 - 32x^2 - 144

Answer 1

help!

Answer 2

Ok. I see that it is -2i. If -2i is a zero then +2i is also a zero.

Answer 3

@Mertsj yes!

Answer 4

That means that x+2i and x-2i are factors

Answer 5

And if those are factors, then (x+2i)(x-2i)= x^2-4i^2=x^2+4 is a factor. So...