-6x2 -11x +2 = 0
ax2 bx c = 0
a = -6
b = -11
c = 2
Δ = b2-4ac
Δ = -11² - (4 * -6 * 2)
Δ = 121 - (4*-12)
Δ = 121 - (-48)
Δ = 169 Δ > 0
-6x2-11x+2=0
x = -b ∓ √Δ 2a
x' = 11 - √169 2*-6 = 11 - 13.0 -12 = -2.0 -12 = 0.166666666667
x" = 11 + √169 2*-6 = 11 + 13.0 -12 = 24.0 -12 = -2.0
x' = 6.0
x" = -72.0
S = {x ∈ R / x' = 6.0, x" = -72.0 }