-4x2 +2x +2 = 0
ax2 bx c = 0
a = -4
b = 2
c = 2
Δ = b2-4ac
Δ = 2² - (4 * -4 * 2)
Δ = 4 - (4*-8)
Δ = 4 - (-32)
Δ = 36 Δ > 0
-4x2+2x+2=0
x = -b ∓ √Δ 2a
x' = -2 - √36 2*-4 = -2 - 6.0 -8 = -8.0 -8 = 1.0
x" = -2 + √36 2*-4 = -2 + 6.0 -8 = 4.0 -8 = -0.5
x' = 16.0
x" = -8.0
S = {x ∈ R / x' = 16.0, x" = -8.0 }