Respuesta :

[tex] {(x - y)}^{2} = {x}^{2} - 2xy + {y}^{2} [/tex]

[tex](3x - ...)^{2} = 9 {x}^{2} - 6x + 1 \\ {(3x - 1)}^{2} = 9 {x}^{2} -6x + 1[/tex]

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