Didn't you mean "Find the possible value or values of z? y is not at all present in this equation.
z^2 - 4z + 4 = 0 can be factored into (z-2)(z-2). Thus, the given equation has two equal, real solutions: z=2 and z=-2.
Answer:
1/5
Step-by-step explanation:
1 + 4 = 5
1/5
I think it is D
Hope my answer help you?