-1x2 -x +6 = 0
ax2 bx c = 0
a = -1
b = -1
c = 6
Δ = b2-4ac
Δ = -² - (4 * -1 * 6)
Δ = 1 - (4*-6)
Δ = 1 - (-24)
Δ = 25 Δ > 0
-x2-x+6=0
x = -b ∓ √Δ 2a
x' = 1 - √25 2*-1 = 1 - 5.0 -2 = -4.0 -2 = 2.0
x" = 1 + √25 2*-1 = 1 + 5.0 -2 = 6.0 -2 = -3.0
x' = 2.0
x" = -3.0
S = {x ∈ R / x' = 2.0, x" = -3.0 }