Question

What is the solution of x^2-4x+4=0

Answer 1

The solution to this would be x = 2.
Because the factoring is (x-2)^2 = 0, which would be x = 2. 

Answer 2

x^2 - 4x + 4 = 0

x^2 - 2x - 2x + 4 = 0

x(x - 2) -2(x - 2) = 0

(x - 2)(x - 2) = 0

x - 2 = 0
x = 2

x = 2 is the only solution to x^2 - 4x + 4 = 0.