D=9-4*-40=169
х1 3+13/2=8
х2= 3-13/2=-5
х²-3х-40=0D = 169x1 = (3+13)/2 = 16/2 = 8x2 = (3-13)/2 = -10/2 = -5
D=9-4*-40=169
х1 3+13/2=8
х2= 3-13/2=-5
х²-3х-40=0
D = 169
x1 = (3+13)/2 = 16/2 = 8
x2 = (3-13)/2 = -10/2 = -5