-12x2 -x +13 = 0
ax2 bx c = 0
a = -12
b = -1
c = 13
Δ = b2-4ac
Δ = -² - (4 * -12 * 13)
Δ = 1 - (4*-156)
Δ = 1 - (-624)
Δ = 625 Δ > 0
-12x2-x+13=0
x = -b ∓ √Δ 2a
x' = 1 - √625 2*-12 = 1 - 25.0 -24 = -24.0 -24 = 1.0
x" = 1 + √625 2*-12 = 1 + 25.0 -24 = 26.0 -24 = -1.08333333333
x' = 144.0
x" = -156.0
S = {x ∈ R / x' = 144.0, x" = -156.0 }