Réponses

2013-03-03T16:35:03+01:00

E = (7x-5)(7x-5-4) = (7x-5) (7x-1)

 

E = (7*-2)-5 * ( 7*-2)-1 = -14-5 * (-14-1) = -19 * +14 = - 266

 

(7x-5)= 0

(7x-9) = 0

7x = 5   x= 5/7

7x=9     x = 9/7

 

 

je crois que c'set ca