-12x2 -14x +20 = 0
ax2 bx c = 0
a = -12
b = -14
c = 20
Δ = b2-4ac
Δ = -14² - (4 * -12 * 20)
Δ = 196 - (4*-240)
Δ = 196 - (-960)
Δ = 1156 Δ > 0
-12x2-14x+20=0
x = -b ∓ √Δ 2a
x' = 14 - √1156 2*-12 = 14 - 34.0 -24 = -20.0 -24 = 0.833333333333
x" = 14 + √1156 2*-12 = 14 + 34.0 -24 = 48.0 -24 = -2.0
x' = 120.0
x" = -288.0
S = {x ∈ R / x' = 120.0, x" = -288.0 }