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= a b
| |
a b
=2( a) (b)
=2ab
(trinomio cuadrado perfecto)
a^2 + 2ab +b^2
= (a)(a) + ab + ab + (b)(b)
= a(a + b) + b(a + b)
= (a + b) (a + b)
= (a + b)^2
(producto notable "Binomio de suma al cuadrado")