Respuesta :

X= -4 X=-2
4+X =0 2+X =0
(4+X)(2+X)=0
(4+X)=0 (2+X)=0
2(4+X). X(2+X)
(8+2X). (2X+X2)
8+2X+2X+X2
8+4X+X2
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