The teacher will be very surprised to see your correct solution 😉
2
4 2 / 3\
240*x + 25*x + 720*x + 5184 = \2400000*x /
sum
-0.0310499759955779 + 0.0310946745704904 + -0.0155473372852452 - 0.0268900676052861*I + -0.0155473372852452 + 0.0268900676052861*I + 0.015524987997789 - 0.0269287777200243*I + 0.015524987997789 + 0.0269287777200243*I
=
0
product
-0.0310499759955779*0.0310946745704904*(-0.0155473372852452 - 0.0268900676052861*I)*(-0.0155473372852452 + 0.0268900676052861*I)*(0.015524987997789 - 0.0269287777200243*I)*(0.015524987997789 + 0.0269287777200243*I)
=
-9.00000000000000e-10
-9.00000000000000e-10
x1 = -0.0310499759955779
x2 = 0.0310946745704904
x3 = -0.0155473372852452 - 0.0268900676052861*I
x4 = -0.0155473372852452 + 0.0268900676052861*I
x5 = 0.015524987997789 - 0.0269287777200243*I
x6 = 0.015524987997789 + 0.0269287777200243*I
x6 = 0.015524987997789 + 0.0269287777200243*i
x1 = 0.0310946745704904
x2 = -0.0155473372852452 + 0.0268900676052861*i
x3 = -0.0310499759955779
x4 = 0.015524987997789 - 0.0269287777200243*i
x5 = -0.0155473372852452 - 0.0268900676052861*i
x6 = 0.015524987997789 + 0.0269287777200243*i
x6 = 0.015524987997789 + 0.0269287777200243*i