-4x2 -14x -10 = 0
ax2 bx c = 0
a = -4
b = -14
c = -10
Δ = b2-4ac
Δ = -14² - (4 * -4 * -10)
Δ = 196 - (4*40)
Δ = 196 - (160)
Δ = 36 Δ > 0
-4x2-14x-10=0
x = -b ∓ √Δ 2a
x' = 14 - √36 2*-4 = 14 - 6.0 -8 = 8.0 -8 = -1.0
x" = 14 + √36 2*-4 = 14 + 6.0 -8 = 20.0 -8 = -2.5
x' = -16.0
x" = -40.0
S = {x ∈ R / x' = -16.0, x" = -40.0 }