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>>X=raiz cuadrada(9)
>>X=3
b) X(X^2+2X+1)=0 ----------> FACTOR COMUN
>>X1=0
>> nos quedaria X^2+2x+1=0 (aplicamos formula general)
>> X2,3= (-2± raiz cuadrada( 2^2 -4(1)(1))) / 2*1
>>X2=-1
>>X3=-1