-4x2 +6x +4 = 0
ax2 bx c = 0
a = -4
b = 6
c = 4
Δ = b2-4ac
Δ = 6² - (4 * -4 * 4)
Δ = 36 - (4*-16)
Δ = 36 - (-64)
Δ = 100 Δ > 0
-4x2+6x+4=0
x = -b ∓ √Δ 2a
x' = -6 - √100 2*-4 = -6 - 10.0 -8 = -16.0 -8 = 2.0
x" = -6 + √100 2*-4 = -6 + 10.0 -8 = 4.0 -8 = -0.5
x' = 32.0
x" = -8.0
S = {x ∈ R / x' = 32.0, x" = -8.0 }