Réponses

2014-03-13T15:24:29+01:00
(3x+4)²-(3x+4)(7x-3)=(3x+4)((3x+4)-(7x-3))=(3x+4)(3x+4-7x+3)=
(3x+4)²-(3x+4)(7x-3)=(3x+4)(1-4x)