-12x2 -6x +18 = 0
ax2 bx c = 0
a = -12
b = -6
c = 18
Δ = b2-4ac
Δ = -6² - (4 * -12 * 18)
Δ = 36 - (4*-216)
Δ = 36 - (-864)
Δ = 900 Δ > 0
-12x2-6x+18=0
x = -b ∓ √Δ 2a
x' = 6 - √900 2*-12 = 6 - 30.0 -24 = -24.0 -24 = 1.0
x" = 6 + √900 2*-12 = 6 + 30.0 -24 = 36.0 -24 = -1.5
x' = 144.0
x" = -216.0
S = {x ∈ R / x' = 144.0, x" = -216.0 }