-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 = -12.0 -12 = 1.0
x" = 14 + √676 2*-6 = 14 + 26.0 -12 = 40.0 -12 = -3.33333333333
x' = 36.0
x" = -120.0
S = {x ∈ R / x' = 36.0, x" = -120.0 }