Respuesta :

Unclear.  What do you mean by "value of?"  Perhaps you meant, "What are the factors of x^2-4x+4?"  Look at the final 4.  Possible factors of 4 are (-1)(-4) and (-2)(-2).  Note that -2-2= -4, which matches the "-4" in x^2-4x+4.

Thus, try the following factors:  (x-2)(x-2).  When mult. together, 
x^2-4x+4 results, so these factors are the correct ones.