Respuesta :

choixongdong
x^2 + 4x + 4 = 0
(x+2)^2 = 0
x+2 = 0
x = -2

answer
this one has only one solution
FrancescaBattistelli
The answer is the first one. 

1) x = {-2}
2) x = {0, -1}
3) x = {1, -1}

The first one only has one solution

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