El profesor se sorprenderá mucho al ver tu solución correcta😉
a*v^2 + b*v + c = 0
D = b^2 - 4 * a * c =
(-8)^2 - 4 * (1) * (9) = 28
v1 = (-b + sqrt(D)) / (2*a)
v2 = (-b - sqrt(D)) / (2*a)
___________ / ___ x1 = -\/ 4 - \/ 7
___________ / ___ x2 = \/ 4 - \/ 7
___________ / ___ x3 = -\/ 4 + \/ 7
___________ / ___ x4 = \/ 4 + \/ 7
x4 = sqrt(sqrt(7) + 4)
suma
___________ ___________ ___________ ___________ / ___ / ___ / ___ / ___ - \/ 4 - \/ 7 + \/ 4 - \/ 7 - \/ 4 + \/ 7 + \/ 4 + \/ 7
=
0
producto
___________ ___________ / ___________\ ___________ / ___ / ___ | / ___ | / ___ -\/ 4 - \/ 7 *\/ 4 - \/ 7 *\-\/ 4 + \/ 7 /*\/ 4 + \/ 7
=
9
9
x1 = -2.57793547457352
x2 = -1.16372191220042
x3 = 1.16372191220042
x4 = 2.57793547457352
x4 = 2.57793547457352