x2 x =0

-6x2 +12x -6 = 0

ax2 bx c = 0

a = -6

b = 12

c = -6

Δ = b2-4ac

Δ = 12² - (4 * -6 * -6)

Δ = 144 - (4*36)

Δ = 144 - (144)

Δ = 0      Δ = 0

x = -b 2*a

x = -12 2*-6

x = 1.0

S = {x ∈ R / x = 1.0}