-6x2 -19x -10 = 0
ax2 bx c = 0
a = -6
b = -19
c = -10
Δ = b2-4ac
Δ = -19² - (4 * -6 * -10)
Δ = 361 - (4*60)
Δ = 361 - (240)
Δ = 121 Δ > 0
-6x2-19x-10=0
x = -b ∓ √Δ 2a
x' = 19 - √121 2*-6 = 19 - 11.0 -12 = 8.0 -12 = -0.666666666667
x" = 19 + √121 2*-6 = 19 + 11.0 -12 = 30.0 -12 = -2.5
x' = -24.0
x" = -90.0
S = {x ∈ R / x' = -24.0, x" = -90.0 }