-12x2 -7x -1 = 0
ax2 bx c = 0
a = -12
b = -7
c = -1
Δ = b2-4ac
Δ = -7² - (4 * -12 * -1)
Δ = 49 - (4*12)
Δ = 49 - (48)
Δ = 1 Δ > 0
-12x2-7x-1=0
x = -b ∓ √Δ 2a
x' = 7 - √1 2*-12 = 7 - 1.0 -24 = 6.0 -24 = -0.25
x" = 7 + √1 2*-12 = 7 + 1.0 -24 = 8.0 -24 = -0.333333333333
x' = -36.0
x" = -48.0
S = {x ∈ R / x' = -36.0, x" = -48.0 }