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2.- (4x-3)(4x+3)= 16x(al cuadrado) - 9
3.- (3y+7)(3y-7)= 9y(al cuadrado) - 49
4.-(2z+2)(2z-2)=4z(al cuadrado) - 4
5.- (x+y)(x-y)= x(al cuadrado) - y(al cuadrado)