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(4+x)(a+b) a esto tendría que quedar, espero haberte ayudado :).
4a + 4b + xa + x b = Agrupas
(4a + 4b) + (xa + xb) = Sacas Factor comun 4 y x
4(a + b) + x(a + b) = Sacas factor comun (a + b)
(a + b)(4 + x)
Respuesta.
(a + b)(4 + x)