-6x2 +13x -5 = 0
ax2 bx c = 0
a = -6
b = 13
c = -5
Δ = b2-4ac
Δ = 13² - (4 * -6 * -5)
Δ = 169 - (4*30)
Δ = 169 - (120)
Δ = 49 Δ > 0
-6x2+13x-5=0
x = -b ∓ √Δ 2a
x' = -13 - √49 2*-6 = -13 - 7.0 -12 = -20.0 -12 = 1.66666666667
x" = -13 + √49 2*-6 = -13 + 7.0 -12 = -6.0 -12 = 0.5
x' = 60.0
x" = 18.0
S = {x ∈ R / x' = 60.0, x" = 18.0 }