-12x2 -18x +12 = 0
ax2 bx c = 0
a = -12
b = -18
c = 12
Δ = b2-4ac
Δ = -18² - (4 * -12 * 12)
Δ = 324 - (4*-144)
Δ = 324 - (-576)
Δ = 900 Δ > 0
-12x2-18x+12=0
x = -b ∓ √Δ 2a
x' = 18 - √900 2*-12 = 18 - 30.0 -24 = -12.0 -24 = 0.5
x" = 18 + √900 2*-12 = 18 + 30.0 -24 = 48.0 -24 = -2.0
x' = 72.0
x" = -288.0
S = {x ∈ R / x' = 72.0, x" = -288.0 }