-6x2 -9x +6 = 0
ax2 bx c = 0
a = -6
b = -9
c = 6
Δ = b2-4ac
Δ = -9² - (4 * -6 * 6)
Δ = 81 - (4*-36)
Δ = 81 - (-144)
Δ = 225 Δ > 0
-6x2-9x+6=0
x = -b ∓ √Δ 2a
x' = 9 - √225 2*-6 = 9 - 15.0 -12 = -6.0 -12 = 0.5
x" = 9 + √225 2*-6 = 9 + 15.0 -12 = 24.0 -12 = -2.0
x' = 18.0
x" = -72.0
S = {x ∈ R / x' = 18.0, x" = -72.0 }