9(x-y)² + 12(x-y)(x+y) + 4(x+y)²
el resultado tiene que salir
= (5x-y)²
el resultado tiene que salir
= (5x-y)²
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Verified answer
Explicación:
= 9x^2 -18xy + 9y^2 +12x^2-12y^2+4x^2+8xy^2+4y^2 = ...
... =