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Caso.
Diferencia de cuadrados.
Aplicas.
a² - b² = (a + b)(a - b)
(a + 1)² - 4 =
(a + 1)² - 2² =
(a + 1 + 2)(a + 1 - 2)
Respuesta.
(a + 1 + 2)(a + 1 - 2)