-6x2 +14x +20 = 0
ax2 bx c = 0
a = -6
b = 14
c = 20
Δ = b2-4ac
Δ = 14² - (4 * -6 * 20)
Δ = 196 - (4*-120)
Δ = 196 - (-480)
Δ = 676 Δ > 0
-6x2+14x+20=0
x = -b ∓ √Δ 2a
x' = -14 - √676 2*-6 = -14 - 26.0 -12 = -40.0 -12 = 3.33333333333
x" = -14 + √676 2*-6 = -14 + 26.0 -12 = 12.0 -12 = -1.0
x' = 120.0
x" = -36.0
S = {x ∈ R / x' = 120.0, x" = -36.0 }