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Caso.
Factor comun por agrupación de terminos.
m² + m - mn - n = Agrupas.
(m² + m) - (mn + n) = Sacas factor comun m y n
m(m + 1) - n(m + 1) = Sacas factor comun (m + 1)
(m + 1)(m -n)
Respuesta.
(m + 1)(m - n)