Question

x2 - 6x + 9 = 0 ????????

Answer 1

x² - 6x + 9 = 0 

Δ = 36 - 36 

Δ = 0 

x = 6 +-√0/2 

x = 6 +-0/2

x' = 6+0/2
x' = 6/2
x' = 3 

x'' = 6-0/2
x'' = 6/2 
x'' = 3                               S = { 3 }                             ok