(a + b - c)(x - 3) - (b - c - a)(x - 3)?
(a + b - c)(x - 3) - (b - c - a)(x - 3).
(a + b - c)(x - 3) - (b - c - a)(x - 3).
En resumen
(a + b - c)(x - 3) - (b - c - a)(x - 3) (x - 3)[(a + b - c) - (b - c - a)] (x - 3)[a + b - c - b + c + a] (x - 3) (2a).
(a + b - c)(x - 3) - (b - c - a)(x - 3)
(x - 3)[(a + b - c) - (b - c - a)]
(x - 3)[a + b - c - b + c + a]
(x - 3) (2a).
Factorizar.
Caso.
Factor Común.
(a + b - c)(x - 3) - (b - c - a)(x - 3) = Sacas factor común (x - 3)
(x - 3)[(a + b - c) - (b - c - a)]
(x - 3)(a + b - c - b + c + a] =
(x - 3)(2a )
Respuesta.
2a(x - 3).