# Math Help - use the given zero ?

1. ## use the given zero ?

Use the given zero to find the remaining zeros in the function.

f(x)= x^4-32x^2-144 ; zero: -2i

Thanks

2. Hi.

Originally Posted by relichunter09
Use the given zero to find the remaining zeros in the function.

f(x)= x^4-32x^2-144 ; zero: -2i
If -2i is a zero, so is +2i.

Use long polynomial division to calculate

x^4-32x^2-144 : (x+2i)(x-2i)

But you should calculate (x+2i)(x-2i) first. After that you are able to find the other zeros, -6 and +6

Rapha