The teacher will be very surprised to see your correct solution 😉
6 4 2 c - 10*c - 5*c + 50 = 0
____ c1 = -\/ 10
____ c2 = \/ 10
4 ___ c3 = -\/ 5
4 ___ c4 = \/ 5
4 ___ c5 = -I*\/ 5
4 ___ c6 = I*\/ 5
c6 = 5^(1/4)*i
sum
____ ____ 4 ___ 4 ___ 4 ___ 4 ___ - \/ 10 + \/ 10 - \/ 5 + \/ 5 - I*\/ 5 + I*\/ 5
=
0
product
____ ____ / 4 ___\ 4 ___ / 4 ___\ 4 ___ -\/ 10 *\/ 10 *\-\/ 5 /*\/ 5 *\-I*\/ 5 /*I*\/ 5
=
50
50
c1 = 3.16227766016838
c2 = 1.49534878122122
c3 = -1.49534878122122
c4 = 1.49534878122122*i
c5 = -1.49534878122122*i
c6 = -3.16227766016838
c6 = -3.16227766016838