Sagot :
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
qui pourrait m'aider silvouplait ? On donne E= (7x-5) au carré -4(7x -5) a) Factoriser E b) Calculer E pour x= -2 c)Résoudre l'equation (7x-5)(7x-9)=0
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