help please...find the complex zeros of the polynomial function.
use the complex zeros to write f in factored form
f(x)=x^4+9x^2+8

Question

help  please...find the complex zeros of the polynomial function.
 use the complex zeros to write f in factored form 
f(x)=x^4+9x^2+8

anonymous · Answer

factor as 
$$(x^2+1)(x^2+8)$$ then set each factor equal to zero and solve

anonymous · Answer

$$x^2+1=0$$
$$x^2=-1$$
$$x=\pm\sqrt{-1}=\pm\sqrt{i}$$ for the first factor

anonymous · Answer

just need to know if done correct f'(x)=18x+4x^3

anonymous · Answer

hold on
it says "find the complex zeros" right, not "find the derivative"

anonymous · Answer

ok i think i did it wrong this is so confusing

anonymous · Answer

you just want the zeros right? this has nothing to do with calculus
factor as i factored above

anonymous · Answer

the question is exact i think i just got lost