-4x2 -10x -4 = 0
ax2 bx c = 0
a = -4
b = -10
c = -4
Δ = b2-4ac
Δ = -10² - (4 * -4 * -4)
Δ = 100 - (4*16)
Δ = 100 - (64)
Δ = 36 Δ > 0
-4x2-10x-4=0
x = -b ∓ √Δ 2a
x' = 10 - √36 2*-4 = 10 - 6.0 -8 = 4.0 -8 = -0.5
x" = 10 + √36 2*-4 = 10 + 6.0 -8 = 16.0 -8 = -2.0
x' = -8.0
x" = -32.0
S = {x ∈ R / x' = -8.0, x" = -32.0 }