-1x2 -3x -2 = 0
ax2 bx c = 0
a = -1
b = -3
c = -2
Δ = b2-4ac
Δ = -3² - (4 * -1 * -2)
Δ = 9 - (4*2)
Δ = 9 - (8)
Δ = 1 Δ > 0
-x2-3x-2=0
x = -b ∓ √Δ 2a
x' = 3 - √1 2*-1 = 3 - 1.0 -2 = 2.0 -2 = -1.0
x" = 3 + √1 2*-1 = 3 + 1.0 -2 = 4.0 -2 = -2.0
x' = -1.0
x" = -2.0
S = {x ∈ R / x' = -1.0, x" = -2.0 }