-12x2 -13x -1 = 0
ax2 bx c = 0
a = -12
b = -13
c = -1
Δ = b2-4ac
Δ = -13² - (4 * -12 * -1)
Δ = 169 - (4*12)
Δ = 169 - (48)
Δ = 121 Δ > 0
-12x2-13x-1=0
x = -b ∓ √Δ 2a
x' = 13 - √121 2*-12 = 13 - 11.0 -24 = 2.0 -24 = -0.0833333333333
x" = 13 + √121 2*-12 = 13 + 11.0 -24 = 24.0 -24 = -1.0
x' = -12.0
x" = -144.0
S = {x ∈ R / x' = -12.0, x" = -144.0 }