The teacher will be very surprised to see your correct solution 😉
4 3 2 x + x + 3*x + 32*x - 10 = 0
____
3 \/ 13
x1 = - - + ------
2 2
____
3 \/ 13
x2 = - - - ------
2 2
x3 = 1 - 3*I
x4 = 1 + 3*I
x4 = 1 + 3*i
sum
____ ____ 3 \/ 13 3 \/ 13 - - + ------ + - - - ------ + 1 - 3*I + 1 + 3*I 2 2 2 2
=
-1
product
/ ____\ / ____\ | 3 \/ 13 | | 3 \/ 13 | |- - + ------|*|- - - ------|*(1 - 3*I)*(1 + 3*I) \ 2 2 / \ 2 2 /
=
-10
-10
x1 = 1.0 - 3.0*i
x2 = -3.30277563773199
x3 = 1.0 + 3.0*i
x4 = 0.302775637731995
x4 = 0.302775637731995