Respuesta :

elfmagicteasjiskx

Answer:

x^3 +2*x^2 -11*x -12 = 0 =>  

=> x^3 +2*x^2 -11*x -12 = 0  

=> (x -3)*(x +4)*(x +1) = 0  

the roots are 3,-4,-1  

I just add them,  

3+(-4)+(-1)=-2

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