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elevamos todo al cuadrado
x^2=((11+V72)+V(11-V72))^2=
x^2= al cuadrado del 1º+ex=V(11+V72)+V(11-V72)=
x^2=(V(11+V72))^2+(V(11-V72))^2+ 2*(V(11+V72)*(V(11-V72))=
x^2= (11+V72)+(11-V72)+2* (6)= 22+12=34
x^2=34
espero que lo entiendas.ya me diras.