-6x2 -9x -3 = 0
ax2 bx c = 0
a = -6
b = -9
c = -3
Δ = b2-4ac
Δ = -9² - (4 * -6 * -3)
Δ = 81 - (4*18)
Δ = 81 - (72)
Δ = 9 Δ > 0
-6x2-9x-3=0
x = -b ∓ √Δ 2a
x' = 9 - √9 2*-6 = 9 - 3.0 -12 = 6.0 -12 = -0.5
x" = 9 + √9 2*-6 = 9 + 3.0 -12 = 12.0 -12 = -1.0
x' = -18.0
x" = -36.0
S = {x ∈ R / x' = -18.0, x" = -36.0 }