Bonjour
a. (x - 3) (2x + 4) = 0
x - 3 = 0 ou 2x + 4 = 0
x = 3 2x = - 4
x = - 4/2 = - 2
b. (5x - 4) (- 3x + 7) = 0
5x - 4 = 0 ou - 3x + 7 = 0
5x = 4 - 3x = - 7
x = 4/5 x = 7/3
c. (6x + 4) (2x - 1) = 0
6x + 4 = 0 ou 2x - 1 = 0
6x = - 4 2x = 1
x = - 4/6 = - 2 x = 1/2
d. (3/4x + 5/3) x = 0
3/4x + 5/3 = 0 ou x = 0
3/4x = - 5/3
9/12x = - 20/12
9x = - 20
x = - 20/9
e. 3x (x - 3)² = 0
3x = 0 ou x - 3 = 0
x = 0 x = 3
