Question

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

-2i is a zero of f(x) = x4 - 21x2 - 100

Answer 1

if -2i is a root, then so is 2i, right?

Answer 2

yes

Answer 3

(x-2i)(x+2i) =???

Answer 4

But I need the other ones too

Answer 5

but that's not all

Answer 6

of course, it is not done yet. I am guiding you. hehehe
Again, (x-2i)(x+2i) =??