-6x2 +18x -12 = 0
ax2 bx c = 0
a = -6
b = 18
c = -12
Δ = b2-4ac
Δ = 18² - (4 * -6 * -12)
Δ = 324 - (4*72)
Δ = 324 - (288)
Δ = 36 Δ > 0
-6x2+18x-12=0
x = -b ∓ √Δ 2a
x' = -18 - √36 2*-6 = -18 - 6.0 -12 = -24.0 -12 = 2.0
x" = -18 + √36 2*-6 = -18 + 6.0 -12 = -12.0 -12 = 1.0
x' = 72.0
x" = 36.0
S = {x ∈ R / x' = 72.0, x" = 36.0 }