4 10000 - c
10000 - c^4
1*(c + 10)*(c - 10)*(c + 10*I)*(c - 10*I)
(((1*(c + 10))*(c - 10))*(c + 10*i))*(c - 10*i)
10000.0 - c^4
/ 2\ -(-10 + c)*(10 + c)*\100 + c /
-(-10 + c)*(10 + c)*(100 + c^2)