-1x2 +11x -10 = 0
ax2 bx c = 0
a = -1
b = 11
c = -10
Δ = b2-4ac
Δ = 11² - (4 * -1 * -10)
Δ = 121 - (4*10)
Δ = 121 - (40)
Δ = 81 Δ > 0
-x2+11x-10=0
x = -b ∓ √Δ 2a
x' = -11 - √81 2*-1 = -11 - 9.0 -2 = -20.0 -2 = 10.0
x" = -11 + √81 2*-1 = -11 + 9.0 -2 = -2.0 -2 = 1.0
x' = 10.0
x" = 1.0
S = {x ∈ R / x' = 10.0, x" = 1.0 }