What is the discriminant of the quadratic equation 0 = –x^2 + 4x – 2?

–4

8

12

24

From this equation : 
a: the coefficient of x^2 & b: the coefficient of x  & c: the last term 
so a=-1 ; b=4 ; c=-2;
discriminant = b^2 -4*a*c
 = (4)^2 -4(-1)(-2)
= 8 

The first one is 2/3the second is 1/160the third is 4/125