-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 = -16.0 -2 = 8.0
x" = -6 + √100 2*-1 = -6 + 10.0 -2 = 4.0 -2 = -2.0
x' = 8.0
x" = -2.0
S = {x ∈ R / x' = 8.0, x" = -2.0 }