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Caso.
Trinomio al cuadrado perfecto.
Aplicas.
x² - 2xy + y² = (x - y)²
x² - 8x + 16 =
x² - 2(x)(4) + 4² =
(x - 4)²
Respuesta.
(x - 4)²
x -4
x -4
-4x-4x = -8x
(x-4)(x-4)