-1x2 +10x -16 = 0
ax2 bx c = 0
a = -1
b = 10
c = -16
Δ = b2-4ac
Δ = 10² - (4 * -1 * -16)
Δ = 100 - (4*16)
Δ = 100 - (64)
Δ = 36 Δ > 0
-x2+10x-16=0
x = -b ∓ √Δ 2a
x' = -10 - √36 2*-1 = -10 - 6.0 -2 = -16.0 -2 = 8.0
x" = -10 + √36 2*-1 = -10 + 6.0 -2 = -4.0 -2 = 2.0
x' = 8.0
x" = 2.0
S = {x ∈ R / x' = 8.0, x" = 2.0 }