-1x2 -6x +16 = 0
ax2 bx c = 0
a = -1
b = -6
c = 16
Δ = b2-4ac
Δ = -6² - (4 * -1 * 16)
Δ = 36 - (4*-16)
Δ = 36 - (-64)
Δ = 100 Δ > 0
-x2-6x+16=0
x = -b ∓ √Δ 2a
x' = 6 - √100 2*-1 = 6 - 10.0 -2 = -4.0 -2 = 2.0
x" = 6 + √100 2*-1 = 6 + 10.0 -2 = 16.0 -2 = -8.0
x' = 2.0
x" = -8.0
S = {x ∈ R / x' = 2.0, x" = -8.0 }