-6x2 +13x -7 = 0
ax2 bx c = 0
a = -6
b = 13
c = -7
Δ = b2-4ac
Δ = 13² - (4 * -6 * -7)
Δ = 169 - (4*42)
Δ = 169 - (168)
Δ = 1 Δ > 0
-6x2+13x-7=0
x = -b ∓ √Δ 2a
x' = -13 - √1 2*-6 = -13 - 1.0 -12 = -14.0 -12 = 1.16666666667
x" = -13 + √1 2*-6 = -13 + 1.0 -12 = -12.0 -12 = 1.0
x' = 42.0
x" = 36.0
S = {x ∈ R / x' = 42.0, x" = 36.0 }