-1x2 -4x -3 = 0
ax2 bx c = 0
a = -1
b = -4
c = -3
Δ = b2-4ac
Δ = -4² - (4 * -1 * -3)
Δ = 16 - (4*3)
Δ = 16 - (12)
Δ = 4 Δ > 0
-x2-4x-3=0
x = -b ∓ √Δ 2a
x' = 4 - √4 2*-1 = 4 - 2.0 -2 = 2.0 -2 = -1.0
x" = 4 + √4 2*-1 = 4 + 2.0 -2 = 6.0 -2 = -3.0
x' = -1.0
x" = -3.0
S = {x ∈ R / x' = -1.0, x" = -3.0 }