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Aplicas.
(a - b)² = a² - 2ab + b²
(m - 3)² - m² - 9 =
m² - 2(m)(3) + 3² - m² - 9 =
m² - 6m + 9 - m² - 9 = Reduces terminos semejantes
- 6m
Respuesta.
- 6m