Réponses

2014-09-21T17:22:16+02:00

Bonjour

a(x) = (x+2)(x-1)-7(x-1)(x+3)

a(x) = (x-1)[(x+2) - 7(x+3)]

a(x) = (x-1)(x + 2 - 7x - 21)

a(x) = (x-1)(-6x - 19)