-3x2 -6x +9 = 0
ax2 bx c = 0
a = -3
b = -6
c = 9
Δ = b2-4ac
Δ = -6² - (4 * -3 * 9)
Δ = 36 - (4*-27)
Δ = 36 - (-108)
Δ = 144 Δ > 0
-3x2-6x+9=0
x = -b ∓ √Δ 2a
x' = 6 - √144 2*-3 = 6 - 12.0 -6 = -6.0 -6 = 1.0
x" = 6 + √144 2*-3 = 6 + 12.0 -6 = 18.0 -6 = -3.0
x' = 9.0
x" = -27.0
S = {x ∈ R / x' = 9.0, x" = -27.0 }