-8x2 -14x -3 = 0
ax2 bx c = 0
a = -8
b = -14
c = -3
Δ = b2-4ac
Δ = -14² - (4 * -8 * -3)
Δ = 196 - (4*24)
Δ = 196 - (96)
Δ = 100 Δ > 0
-8x2-14x-3=0
x = -b ∓ √Δ 2a
x' = 14 - √100 2*-8 = 14 - 10.0 -16 = 4.0 -16 = -0.25
x" = 14 + √100 2*-8 = 14 + 10.0 -16 = 24.0 -16 = -1.5
x' = -16.0
x" = -96.0
S = {x ∈ R / x' = -16.0, x" = -96.0 }