Question

$x^{2} -6x+9=0$

Answer 1

x^2 - 6x + 9 = 0
x = 6 +- √ 0/2
x' = 3
x" = 3

S = { 3 ; 3 }

Answer 2

Boa noite!
x² - 6x + 9 = 0
a=1, b = -6, c = 9
Δ = b² - 4ac
Δ = (-6)² - 4.1.9
Δ = 36 - 36
Δ = 0
X = -b+-√Δ/2a
X = -(-6)+-√0/2.1
X = 6+-0/2
X' = 6-0/2 = 3
X" = 6+0/2 = 3

Espero ter ajudado  :)