-6x2 -13x -2 = 0
ax2 bx c = 0
a = -6
b = -13
c = -2
Δ = b2-4ac
Δ = -13² - (4 * -6 * -2)
Δ = 169 - (4*12)
Δ = 169 - (48)
Δ = 121 Δ > 0
-6x2-13x-2=0
x = -b ∓ √Δ 2a
x' = 13 - √121 2*-6 = 13 - 11.0 -12 = 2.0 -12 = -0.166666666667
x" = 13 + √121 2*-6 = 13 + 11.0 -12 = 24.0 -12 = -2.0
x' = -6.0
x" = -72.0
S = {x ∈ R / x' = -6.0, x" = -72.0 }