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4x²+12x+4+4=0
4x²+12x+8=0
aplicas la formula cuadrática
[-b+√(b²-4*a*c)]/(2*a) y [-b-√(b²-4*a*c)]/(2*a)
donde a, b y c son los coeficientes; así: ax²+bx+c
luego:
[-(12)-√((12)²-4*(4)*(8))]/(2*(4)) = -2
[-(12)+√((12)²-4*(4)*(8))]/(2*(4)) = -1