Réponses

2014-01-18T21:06:26+01:00
A = (x-2)(2x+6)-2x(x+3)+3(x+4)\\A = 2(x-2)(x+3)-2x(x+3)+3(x+4)\\A = (x+3)[2(x-2)-2x]+3(x+4)\\A = (x+3)[2x-4-2x]+3(x+4)\\A = -4(x+3)+3(x+4)\\A = -4x-12+3x+12\\A = -4x+3x\\A = -x

En espérant t'avoir aidé.
2014-01-18T22:32:52+01:00
(X-2)(2x+6)-2x(x+3)+3(x+4)
(X-2)(2x+6)-(2x2+6x)+3(x+4)
(X-2)(2x+6)-x(2x+6)+3(x+4)
(2x+6)[(x-2)-x+3(x+4)]
(2x+6)[x-2-x+3x+12]
(2x+6)[3x+10x]
(2x+6)(3x+10x)