T^2 = A
.........................................
4A^2 - 7A + 3 = 0
D = 49 -4*4*3 = 49 - 48 = 1
V D = 1
A1 = ( 7 + 1 ) : 8 = 1
A2 = 6\8 = 0.75
..............................................
T^2 = A
T^2 = 1 ----> T1 = 1
T^2 = 0.75 ----> T2 = V (0.75 )