-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 = -4.0 -8 = 0.5
x" = 6 + √100 2*-4 = 6 + 10.0 -8 = 16.0 -8 = -2.0
x' = 8.0
x" = -32.0
S = {x ∈ R / x' = 8.0, x" = -32.0 }