Respuesta :

2x^2 -5x -3 = 0

D = 25 +24 = 49

x_1,2 = (5+/- sqrt49)/4 = (5+/-7)/4 = -2/4 = -1/2 and 12/4 = 3 

x_1,2 = -1/2 and 3

hope this will help you