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Diferencia de cuadros.
Aplicas.
a² - b² = (a + b)(a - b)
x² - 9 =
x² - 3² =
(x + 3)(x - 3)
x² - 25y² =
x² - 5²y² =
(x + 5y)(x - 5y)
Factorizar.
Trinomio al cuadrado perfecto
x² - 2x + 1 =
(x - 1)²