Algebra 2
posted by Jessica on .
How do I solve polynomial equation by finding all complex roots?
The problem is:
factor each expression and find all complex roots of x^3+64
I got as far as x^3+64=(x+4)(x^24x+16)
Now how do i find the roots of (x+4) and the roots of (x^24x+16)
Thanks

the root of x+4=0 is x=2
the roots of the next can be solved by the quadratic equation..
x=(4+sqrt(1664))/2
that gives you three roots. 
When a trinomial is factored as (x + m)(x + n), what is the sum of m and n?
A. The coefficient of the xterm of the trinomial
B. The constant term of the trinomial
C. The degree of the trinomial
D. The coefficient of the x2term of the trinomial