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Caso.
Trinimio al cuadrado perfecto.
Aplicas.
a² - 2ab + b² = (a - b)²
- 4m(m - n) + 4m² + (m -n)² = Organizas el trinomio
4m² - 4m(m - n) + (m - n)² =
2²m² - 2(2m)(m - n) + (m - n)² =
(2m - (m - n))² =
(2m - m + n)² =
(m + n)²
Respuesta.
(m + n)²