coucou
exercice 3
a) 7(x-8)+15 = 9x+3
7x -56 +15 = 9x +3
-2x -41 = 3
-2x = 44
x = -22
b) 5x+1 = 2-4
5x +1 = -2
5x = -3
x = -3/5
c) (7x+14)(5-13x)=0
revient a resoudre
7x+14=0 ou 5-13x=0
7x=-14 ou -13x=-5
x=-2 ou x=5/13
d) x^2 -16 =0
x^2 - 4^2 = 0
(x-4)(x+4)=0
revient a resoudre
x-4=0 ou x+4=0
x=4 ou x=-4
voila j espere t avoir aider