El profesor se sorprenderá mucho al ver tu solución correcta😉
a*x^2 + b*x + c = 0
D = b^2 - 4 * a * c =
(15)^2 - 4 * (-1) * (-57) = -3
x1 = (-b + sqrt(D)) / (2*a)
x2 = (-b - sqrt(D)) / (2*a)
___ 15 I*\/ 3 x1 = -- - ------- 2 2
___ 15 I*\/ 3 x2 = -- + ------- 2 2
x2 = 15/2 + sqrt(3)*i/2
suma
___ ___ 15 I*\/ 3 15 I*\/ 3 -- - ------- + -- + ------- 2 2 2 2
=
15
producto
/ ___\ / ___\ |15 I*\/ 3 | |15 I*\/ 3 | |-- - -------|*|-- + -------| \2 2 / \2 2 /
=
57
57
x1 = 7.5 + 0.866025403784439*i
x2 = 7.5 - 0.866025403784439*i
x2 = 7.5 - 0.866025403784439*i