-4x2 +12x -8 = 0
ax2 bx c = 0
a = -4
b = 12
c = -8
Δ = b2-4ac
Δ = 12² - (4 * -4 * -8)
Δ = 144 - (4*32)
Δ = 144 - (128)
Δ = 16 Δ > 0
-4x2+12x-8=0
x = -b ∓ √Δ 2a
x' = -12 - √16 2*-4 = -12 - 4.0 -8 = -16.0 -8 = 2.0
x" = -12 + √16 2*-4 = -12 + 4.0 -8 = -8.0 -8 = 1.0
x' = 32.0
x" = 16.0
S = {x ∈ R / x' = 32.0, x" = 16.0 }