The teacher will be very surprised to see your correct solution 😉
a*x^2 + b*x + c = 0
D = b^2 - 4 * a * c =
(3)^2 - 4 * (1) * (5) = -11
x1 = (-b + sqrt(D)) / (2*a)
x2 = (-b - sqrt(D)) / (2*a)
sum
____ ____ 3 I*\/ 11 3 I*\/ 11 - - - -------- + - - + -------- 2 2 2 2
=
-3
product
/ ____\ / ____\ | 3 I*\/ 11 | | 3 I*\/ 11 | |- - - --------|*|- - + --------| \ 2 2 / \ 2 2 /
=
5
5
____ 3 I*\/ 11 x1 = - - - -------- 2 2
____ 3 I*\/ 11 x2 = - - + -------- 2 2
x2 = -3/2 + sqrt(11)*i/2
x1 = -1.5 + 1.6583123951777*i
x2 = -1.5 - 1.6583123951777*i
x2 = -1.5 - 1.6583123951777*i