Verified answer

bonjour

x² - 7 x + 9 = 9

x² - 7 x = 9 - 9

x² - 7 x = 0

x ( x - 7 )  = 0

2 solutions  

x = 0

x = 7

Bonjour,

Il y a donc 2 solutions,

Donc x = 0 ou x = 7