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Esto es un producto de binomios :
(√5 +2) (√5 -2) = √5 √5 - √5 2 + √5 2 - 2²
= 5 - 4
= 1
suerte
(√5+2).(√5-2) ;
(√5)==>>a;
(2)==>>b;
(√5+2)•(√5-2) = (√5)^2- (2)^2= 5-4=1;
raíz desaparece cuando el grado
(√5)^2=5;
(2)^2=2•2=4;
5-4=1;