Dm numéro 62 svp je galère trop

62)
a) (x + 8) (9 - x) = 0
x + 8 = 0
x = - 8
ou
9 - x = 0
x = - 9

b) (2x + 4) (3 + x) = 0
2x + 4 = 0
2x = - 4
x = - 4/2
x = - 2
ou
3 + x = 0
x = - 3

c) 7x (9x + 11) = 0
Si x = 0 ou x = - 11/9

d) (5x - 7) (1 - 4x) =0
5x - 7 = 0
5x = 7
x = 7/5
ou
1 - 4x = 0
4x = - 1
x = - 1/4